Questions on the usage and meaning of words in mathematics, the names for mathematical entities, and other such questions.

learn more… | top users | synonyms (2)

7
votes
10answers
3k views

What is a real number (also rational, decimal, integer, natural, cardinal, ordinal…)?

In mathematics there seem to be a lot of different types of numbers. What exactly are: Real numbers Integers Rationals numbers Decimals Complex numbers Natural numbers Cardinals Ordinals And as ...