Something is either A or non-A represents?

Answer 1

Aristotle's Law of the Excluded Middle. Aristotle's "laws" of logic, including the law of the "excluded middle," can serve simple arguments, but for more complex analyses, more sophisticated systems are needed -- just as, for example, simple arithmetic is satisfactory if we are counting money in a piggy-bank, but for determining the rate at which a liquid cools, we need a more complex mathematical system.