A time scale T is an arbitrary nonempty closed subset of the

**set of real numbers**R.This definition appears very frequently and is found in the following Acronym Finder categories:

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A time scale T is an arbitrary nonempty closed subset of the **set of real numbers** R.

Continuing this process, we study and name the following infinite sets: the set Z of integers, the set Q of rational numbers, and in an explosive burst--to include the set A of all algebraic numbers, and the set of all transcendental numbers, T, finally arriving at the **set of real numbers**, R, so familiar to scientists today.

Because of this, mathematicians now refer to the infinite **set of real numbers** as uncountable.