A differential propositional calculus is a propositional calculus extended by a set of terms for describing aspects of change and difference, for example, processes taking place in a universe of discourse or transformations mapping a source universe to a target universe.
Casual Introduction
Consider the situation represented by the venn diagram in Figure 1.
The area of the rectangle represents a universe of discourse, The universe under discussion may be a population of individuals having various additional properties or it may be a collection of locations occupied by various individuals. The area of the “circle” represents the individuals having the property
or the locations in the corresponding region
Four individuals,
are singled out by name. It happens that
and
currently reside in region
while
and
do not.
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