2. Expressions, the basic objects of formal calculus

2.1 Variables and values

Consider the mathematical expression $e^{- x^{2}}$ , to be normalized so that its integral from – ∞ to + ∞ has the value 1. This can be translated into the following instructions:

> restart;

> y:=exp(–x^2);

$y : = e^{(- x^{2})}$

...

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Expressions, the basic objects of formal calculus

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