Last time we contemplated the penultimately simple algebraic expression as a name for a set of arithmetic expressions, namely, taking the equality sign in the appropriate sense.

Then we asked the corresponding question about the operator   The above selection of arithmetic expressions is what it means to contemplate the absence or presence of the arithmetic constant in the place of the operand in the algebraic expression   But what would it mean to contemplate the absence or presence of the operator in the algebraic expression

Evidently, a variation between the absence and the presence of the operator in the algebraic expression refers to a variation between the algebraic expression and the algebraic expression somewhat as pictured below.

But how shall we signify such variations in a coherent calculus?

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