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![\begin{array}{*{4}{l}} \multicolumn{4}{l}{\mathrm{D}f(p, q, r, \mathrm{d}p, \mathrm{d}q, \mathrm{d}r) =} \\[10pt] & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{(} \mathrm{d}p \texttt{)(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~} & + & \texttt{~} p \texttt{~~} q \texttt{~(} r \texttt{)} \cdot \texttt{(} \mathrm{d}p \texttt{)(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} & + & \texttt{~} p \texttt{~(} q \texttt{)~} r \texttt{~} \cdot \texttt{(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} & + & \texttt{~} p \texttt{~(} q \texttt{)(} r \texttt{)} \cdot \texttt{(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} \end{array}](https://s0.wp.com/latex.php?latex=%5Cbegin%7Barray%7D%7B%2A%7B4%7D%7Bl%7D%7D++%5Cmulticolumn%7B4%7D%7Bl%7D%7B%5Cmathrm%7BD%7Df%28p%2C+q%2C+r%2C+%5Cmathrm%7Bd%7Dp%2C+%5Cmathrm%7Bd%7Dq%2C+%5Cmathrm%7Bd%7Dr%29+%3D%7D++%5C%5C%5B10pt%5D++%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%28%7D+r+%5Ctexttt%7B%29%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%26+%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%28%7D+q+%5Ctexttt%7B%29%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%28%7D+q+%5Ctexttt%7B%29%28%7D+r+%5Ctexttt%7B%29%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5Cend%7Barray%7D&bg=ffffff&fg=000000&s=1&c=20201002)
![\begin{array}{*{4}{l}} + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)(} \mathrm{d}r \texttt{)} & + & \texttt{(} p \texttt{)~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)(} \mathrm{d}r \texttt{)} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~} & + & \texttt{(} p \texttt{)~} q \texttt{~(} r \texttt{)} \cdot \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} & + & \texttt{(} p \texttt{)(} q \texttt{)~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} & + & \texttt{(} p \texttt{)(} q \texttt{)(} r \texttt{)} \cdot \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} \end{array}](https://s0.wp.com/latex.php?latex=%5Cbegin%7Barray%7D%7B%2A%7B4%7D%7Bl%7D%7D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%26+%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%7E%7D+q+%5Ctexttt%7B%7E%28%7D+r+%5Ctexttt%7B%29%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%26+%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%28%7D+q+%5Ctexttt%7B%29%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%28%7D+q+%5Ctexttt%7B%29%28%7D+r+%5Ctexttt%7B%29%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5Cend%7Barray%7D&bg=ffffff&fg=000000&s=1&c=20201002)
![\begin{array}{*{4}{l}} \multicolumn{4}{l}{\mathrm{D}f(p, q, r, \mathrm{d}p, \mathrm{d}q, \mathrm{d}r) =} \\[10pt] & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} & + & \texttt{(} p \texttt{)(} q \texttt{)(} r \texttt{)} \cdot \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} & + & \texttt{(} p \texttt{)(} q \texttt{)~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~} & + & \texttt{(} p \texttt{)~} q \texttt{~(} r \texttt{)} \cdot \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~} \end{array}](https://s0.wp.com/latex.php?latex=%5Cbegin%7Barray%7D%7B%2A%7B4%7D%7Bl%7D%7D++%5Cmulticolumn%7B4%7D%7Bl%7D%7B%5Cmathrm%7BD%7Df%28p%2C+q%2C+r%2C+%5Cmathrm%7Bd%7Dp%2C+%5Cmathrm%7Bd%7Dq%2C+%5Cmathrm%7Bd%7Dr%29+%3D%7D++%5C%5C%5B10pt%5D++%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%28%7D+q+%5Ctexttt%7B%29%28%7D+r+%5Ctexttt%7B%29%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%26+%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%28%7D+q+%5Ctexttt%7B%29%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%7E%7D+q+%5Ctexttt%7B%7E%28%7D+r+%5Ctexttt%7B%29%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5Cend%7Barray%7D&bg=ffffff&fg=000000&s=1&c=20201002)
![\begin{array}{*{4}{l}} + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)(} \mathrm{d}r \texttt{)} & + & \texttt{(} p \texttt{)~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)(} \mathrm{d}r \texttt{)} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} & + & \texttt{~} p \texttt{~(} q \texttt{)(} r \texttt{)} \cdot \texttt{(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} & + & \texttt{~} p \texttt{~(} q \texttt{)~} r \texttt{~} \cdot \texttt{(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{(} \mathrm{d}p \texttt{)(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~} & + & \texttt{~} p \texttt{~~} q \texttt{~(} r \texttt{)} \cdot \texttt{(} \mathrm{d}p \texttt{)(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~}\end{array}](https://s0.wp.com/latex.php?latex=%5Cbegin%7Barray%7D%7B%2A%7B4%7D%7Bl%7D%7D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%26+%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%28%7D+q+%5Ctexttt%7B%29%28%7D+r+%5Ctexttt%7B%29%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%26+%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%28%7D+q+%5Ctexttt%7B%29%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%28%7D+r+%5Ctexttt%7B%29%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D%5Cend%7Barray%7D&bg=ffffff&fg=000000&s=1&c=20201002)
![\begin{array}{*{4}{l}} \multicolumn{4}{l}{\mathrm{D}f(p, q, r, \mathrm{d}p, \mathrm{d}q, \mathrm{d}r) =} \\[10pt] & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)(} \mathrm{d}r \texttt{)} & + & \texttt{(} p \texttt{)~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)(} \mathrm{d}r \texttt{)} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} & + & \texttt{~} p \texttt{~(} q \texttt{)~} r \texttt{~} \cdot \texttt{(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{(} \mathrm{d}p \texttt{)(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~} & + & \texttt{~} p \texttt{~~} q \texttt{~(} r \texttt{)} \cdot \texttt{(} \mathrm{d}p \texttt{)(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~} \end{array}](https://s0.wp.com/latex.php?latex=%5Cbegin%7Barray%7D%7B%2A%7B4%7D%7Bl%7D%7D++%5Cmulticolumn%7B4%7D%7Bl%7D%7B%5Cmathrm%7BD%7Df%28p%2C+q%2C+r%2C+%5Cmathrm%7Bd%7Dp%2C+%5Cmathrm%7Bd%7Dq%2C+%5Cmathrm%7Bd%7Dr%29+%3D%7D++%5C%5C%5B10pt%5D++%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%26+%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%26+%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%28%7D+q+%5Ctexttt%7B%29%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%28%7D+r+%5Ctexttt%7B%29%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5Cend%7Barray%7D&bg=ffffff&fg=000000&s=1&c=20201002)
![\begin{array}{*{4}{l}} + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} & + & \texttt{(} p \texttt{)(} q \texttt{)~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~} & + & \texttt{(} p \texttt{)~} q \texttt{~(} r \texttt{)} \cdot \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} & + & \texttt{~} p \texttt{~(} q \texttt{)(} r \texttt{)} \cdot \texttt{(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} \\[10pt] + & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} \cdot \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} & + & \texttt{(} p \texttt{)(} q \texttt{)(} r \texttt{)} \cdot \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} \end{array}](https://s0.wp.com/latex.php?latex=%5Cbegin%7Barray%7D%7B%2A%7B4%7D%7Bl%7D%7D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%26+%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%28%7D+q+%5Ctexttt%7B%29%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%7E%7D+q+%5Ctexttt%7B%7E%28%7D+r+%5Ctexttt%7B%29%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%28%7D+q+%5Ctexttt%7B%29%28%7D+r+%5Ctexttt%7B%29%7D+%5Ccdot++%5Ctexttt%7B%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5C%5C%5B10pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%28%7D+q+%5Ctexttt%7B%29%28%7D+r+%5Ctexttt%7B%29%7D+%5Ccdot++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5Cend%7Barray%7D&bg=ffffff&fg=000000&s=1&c=20201002)
![\begin{array}{*{4}{c}} \multicolumn{4}{l}{\mathrm{D}f(p, q, r, \mathrm{d}p, \mathrm{d}q, \mathrm{d}r) =} \\[10pt] & \texttt{~} p \texttt{~~} q \texttt{~~} r \texttt{~} & \cdot & \texttt{((} \mathrm{d}p \texttt{)(} \mathrm{d}q \texttt{)(} \mathrm{d}r \texttt{))} \\[4pt] + & \texttt{(} p \texttt{)~} q \texttt{~~} r \texttt{~} & \cdot & \texttt{~~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)(} \mathrm{d}r \texttt{)~} \\[4pt] + & \texttt{~} p \texttt{~(} q \texttt{)~} r \texttt{~} & \cdot & \texttt{~(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)~} \\[4pt] + & \texttt{~} p \texttt{~~} q \texttt{~(} r \texttt{)} & \cdot & \texttt{~(} \mathrm{d}p \texttt{)(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~~} \\[4pt] + & \texttt{(} p \texttt{)(} q \texttt{)~} r \texttt{~} & \cdot & \texttt{~~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)~} \\[4pt] + & \texttt{(} p \texttt{)~} q \texttt{~(} r \texttt{)} & \cdot & \texttt{~~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)~} \mathrm{d}r \texttt{~~} \\[4pt] + & \texttt{~} p \texttt{~(} q \texttt{)(} r \texttt{)} & \cdot & \texttt{~(} \mathrm{d}p \texttt{)~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~~} \\[4pt] + & \texttt{(} p \texttt{)(} q \texttt{)(} r \texttt{)} & \cdot & \texttt{~~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~~} \end{array}](https://s0.wp.com/latex.php?latex=%5Cbegin%7Barray%7D%7B%2A%7B4%7D%7Bc%7D%7D++%5Cmulticolumn%7B4%7D%7Bl%7D%7B%5Cmathrm%7BD%7Df%28p%2C+q%2C+r%2C+%5Cmathrm%7Bd%7Dp%2C+%5Cmathrm%7Bd%7Dq%2C+%5Cmathrm%7Bd%7Dr%29+%3D%7D++%5C%5C%5B10pt%5D++%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%28%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%29%7D++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%7E%7D+q+%5Ctexttt%7B%7E%7E%7D+r+%5Ctexttt%7B%7E%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7E%7D++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%28%7D+q+%5Ctexttt%7B%29%7E%7D+r+%5Ctexttt%7B%7E%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7E%7D++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%7E%7D+q+%5Ctexttt%7B%7E%28%7D+r+%5Ctexttt%7B%29%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7E%7D++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%28%7D+q+%5Ctexttt%7B%29%7E%7D+r+%5Ctexttt%7B%7E%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7E%7D++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%7E%7D+q+%5Ctexttt%7B%7E%28%7D+r+%5Ctexttt%7B%29%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7E%7D++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+p+%5Ctexttt%7B%7E%28%7D+q+%5Ctexttt%7B%29%28%7D+r+%5Ctexttt%7B%29%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7E%7D++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%28%7D+q+%5Ctexttt%7B%29%28%7D+r+%5Ctexttt%7B%29%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7E%7D++%5Cend%7Barray%7D&bg=ffffff&fg=000000&s=1&c=20201002)
![\begin{array}{*{4}{c}} \multicolumn{4}{l}{\mathrm{D}f(p, q, r, \mathrm{d}p, \mathrm{d}q, \mathrm{d}r) =} \\[10pt] & p \texttt{~} q \texttt{~} r & \cdot & \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} \\[4pt] + & p \texttt{~} q & \cdot & \texttt{~} \mathrm{d}r \texttt{~(} \mathrm{d}p \texttt{)(} \mathrm{d}q \texttt{)} \\[4pt] + & p \texttt{~} r & \cdot & \texttt{~} \mathrm{d}q \texttt{~(} \mathrm{d}p \texttt{)(} \mathrm{d}r \texttt{)} \\[4pt] + & q \texttt{~} r & \cdot & \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)(} \mathrm{d}r \texttt{)} \\[4pt] + & \texttt{((} p \texttt{,} q \texttt{))} ~ r & \cdot & \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} \\[4pt] + & \texttt{((} p \texttt{,} r \texttt{))} ~ q & \cdot & \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}r \texttt{~(} \mathrm{d}q \texttt{)} \\[4pt] + & \texttt{((} q \texttt{,} r \texttt{))} ~ p & \cdot & \texttt{~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~(} \mathrm{d}p \texttt{)} \\[4pt] + & \texttt{(} p \texttt{)(} q \texttt{)(} r \texttt{)} & \cdot & \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} \end{array}](https://s0.wp.com/latex.php?latex=%5Cbegin%7Barray%7D%7B%2A%7B4%7D%7Bc%7D%7D++%5Cmulticolumn%7B4%7D%7Bl%7D%7B%5Cmathrm%7BD%7Df%28p%2C+q%2C+r%2C+%5Cmathrm%7Bd%7Dp%2C+%5Cmathrm%7Bd%7Dq%2C+%5Cmathrm%7Bd%7Dr%29+%3D%7D++%5C%5C%5B10pt%5D++%26++p+%5Ctexttt%7B%7E%7D+q+%5Ctexttt%7B%7E%7D+r++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5C%5C%5B4pt%5D++%2B+%26++p+%5Ctexttt%7B%7E%7D+q++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7D++%5C%5C%5B4pt%5D++%2B+%26++p+%5Ctexttt%7B%7E%7D+r++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%5C%5C%5B4pt%5D++%2B+%26++q+%5Ctexttt%7B%7E%7D+r++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%28%28%7D+p+%5Ctexttt%7B%2C%7D+q+%5Ctexttt%7B%29%29%7D+%7E+r++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%28%28%7D+p+%5Ctexttt%7B%2C%7D+r+%5Ctexttt%7B%29%29%7D+%7E+q++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7D++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%28%28%7D+q+%5Ctexttt%7B%2C%7D+r+%5Ctexttt%7B%29%29%7D+%7E+p++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7D++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%28%7D+q+%5Ctexttt%7B%29%28%7D+r+%5Ctexttt%7B%29%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%5Cend%7Barray%7D&bg=ffffff&fg=000000&s=1&c=20201002)
![\begin{array}{*{4}{c}} \multicolumn{4}{l}{\mathrm{D}f(p, q, r, \mathrm{d}p, \mathrm{d}q, \mathrm{d}r) =} \\[10pt] & \texttt{~} \mathrm{d}p \texttt{~(} \mathrm{d}q \texttt{)(} \mathrm{d}r \texttt{)} & \cdot & q \texttt{~} r \\[4pt] + & \texttt{~} \mathrm{d}q \texttt{~(} \mathrm{d}p \texttt{)(} \mathrm{d}r \texttt{)} & \cdot & p \texttt{~} r \\[4pt] + & \texttt{~} \mathrm{d}r \texttt{~(} \mathrm{d}p \texttt{)(} \mathrm{d}q \texttt{)} & \cdot & p \texttt{~} q \\[4pt] + & \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~(} \mathrm{d}r \texttt{)} & \cdot & \texttt{((} p \texttt{,} q \texttt{))} ~ r \\[4pt] + & \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}r \texttt{~(} \mathrm{d}q \texttt{)} & \cdot & \texttt{((} p \texttt{,} r \texttt{))} ~ q \\[4pt] + & \texttt{~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~(} \mathrm{d}p \texttt{)} & \cdot & \texttt{((} q \texttt{,} r \texttt{))} ~ p \\[4pt] + & \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} & \cdot & p \texttt{~} q \texttt{~} r \\[4pt] + & \texttt{~} \mathrm{d}p \texttt{~~} \mathrm{d}q \texttt{~~} \mathrm{d}r \texttt{~} & \cdot & \texttt{(} p \texttt{)(} q \texttt{)(} r \texttt{)} \end{array}](https://s0.wp.com/latex.php?latex=%5Cbegin%7Barray%7D%7B%2A%7B4%7D%7Bc%7D%7D++%5Cmulticolumn%7B4%7D%7Bl%7D%7B%5Cmathrm%7BD%7Df%28p%2C+q%2C+r%2C+%5Cmathrm%7Bd%7Dp%2C+%5Cmathrm%7Bd%7Dq%2C+%5Cmathrm%7Bd%7Dr%29+%3D%7D++%5C%5C%5B10pt%5D++%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%26+%5Ccdot+%26++q+%5Ctexttt%7B%7E%7D+r++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%26+%5Ccdot+%26++p+%5Ctexttt%7B%7E%7D+r++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7D++%26+%5Ccdot+%26++p+%5Ctexttt%7B%7E%7D+q++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%29%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%28%28%7D+p+%5Ctexttt%7B%2C%7D+q+%5Ctexttt%7B%29%29%7D+%7E+r++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%29%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%28%28%7D+p+%5Ctexttt%7B%2C%7D+r+%5Ctexttt%7B%29%29%7D+%7E+q++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%28%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%29%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%28%28%7D+q+%5Ctexttt%7B%2C%7D+r+%5Ctexttt%7B%29%29%7D+%7E+p++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%5Ccdot+%26++p+%5Ctexttt%7B%7E%7D+q+%5Ctexttt%7B%7E%7D+r++%5C%5C%5B4pt%5D++%2B+%26++%5Ctexttt%7B%7E%7D+%5Cmathrm%7Bd%7Dp+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dq+%5Ctexttt%7B%7E%7E%7D+%5Cmathrm%7Bd%7Dr+%5Ctexttt%7B%7E%7D++%26+%5Ccdot+%26++%5Ctexttt%7B%28%7D+p+%5Ctexttt%7B%29%28%7D+q+%5Ctexttt%7B%29%28%7D+r+%5Ctexttt%7B%29%7D++%5Cend%7Barray%7D&bg=ffffff&fg=000000&s=1&c=20201002)
![\begin{array}{|*{8}{c}|} \multicolumn{8}{c}{\text{Difference Map}~\text{D}(pqr)} \\[4pt] \hline&&&&&&& \\ \texttt{~}p\texttt{~~}q\texttt{~~}r\texttt{~}& \texttt{(}p\texttt{)~}q\texttt{~~}r\texttt{~}& \texttt{~}p\texttt{~(}q\texttt{)~}r\texttt{~}& \texttt{~}p\texttt{~~}q\texttt{~(}r\texttt{)}& \texttt{(}p\texttt{)(}q\texttt{)~}r\texttt{~}& \texttt{(}p\texttt{)~}q\texttt{~(}r\texttt{)}& \texttt{~}p\texttt{~(}q\texttt{)(}r\texttt{)}& \texttt{(}p\texttt{)(}q\texttt{)(}r\texttt{)} \\[8pt] \hline&&&&&&& \\ 0&&&&&&& \\ \texttt{~}\text{d}p\texttt{~(}\text{d}q\texttt{)(}\text{d}r\texttt{)}& \text{d}p\texttt{(}\text{d}q\texttt{)(}\text{d}r\texttt{)}&&&&&& \\ \texttt{(}\text{d}p\texttt{)~}\text{d}q\texttt{~(}\text{d}r\texttt{)}&& \texttt{(}\text{d}p\texttt{)}\text{d}q\texttt{(}\text{d}r\texttt{)}&&&&& \\ \texttt{(}\text{d}p\texttt{)(}\text{d}q\texttt{)~}\text{d}r\texttt{~}&&& \texttt{(}\text{d}p\texttt{)(}\text{d}q\texttt{)}\text{d}r&&&& \\ \texttt{~}\text{d}p\texttt{~~}\text{d}q\texttt{~(}\text{d}r\texttt{)}&&&& \text{d}p~\text{d}q\texttt{(}\text{d}r\texttt{)}&&& \\ \texttt{~}\text{d}p\texttt{~(}\text{d}q\texttt{)~}\text{d}r\texttt{~}&&&&& \text{d}p\texttt{(}\text{d}q\texttt{)}\text{d}r&& \\ \texttt{(}\text{d}p\texttt{)~}\text{d}q\texttt{~~}\text{d}r\texttt{~}&&&&&& \texttt{(}\text{d}p\texttt{)}\text{d}q~\text{d}r& \\ \texttt{~}\text{d}p\texttt{~~}\text{d}q\texttt{~~}\text{d}r\texttt{~}&&&&&&& \text{d}p~\text{d}q~\text{d}r \\[8pt] \hline&&&&&&& \\ \texttt{((}\text{d}p\texttt{)(}\text{d}q\texttt{)(}\text{d}r\texttt{))}& \text{d}p\texttt{(}\text{d}q\texttt{)(}\text{d}r\texttt{)}& \texttt{(}\text{d}p\texttt{)}\text{d}q\texttt{(}\text{d}r\texttt{)}& \texttt{(}\text{d}p\texttt{)(}\text{d}q\texttt{)}\text{d}r& \text{d}p~\text{d}q\texttt{(}\text{d}r\texttt{)}& \text{d}p\texttt{(}\text{d}q\texttt{)}\text{d}r& \texttt{(}\text{d}p\texttt{)}\text{d}q~\text{d}r& \text{d}p~\text{d}q~\text{d}r \\[8pt] \hline 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