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...e: one, two, three, four, five, six. They are sometimes called '''counting numbers'''. The '''[[Set#Cardinality_of_a_set|cardinality]]''' of a [[set]] is the cardinal number that tells how many things are in the set. ...

...e list of real numbers, you can create a number not on that list. The real numbers have a cardinality of '''c'''. * [[Cardinal number]] ...

..., which means "without end". Infinity goes on forever, so sometimes space, numbers, and other things are said to be 'infinite', because they never come to a s ...l infinity is a more abstract idea. For example, there are infinitely many numbers as it is impossible to write them all down. ...

...numbers have a [[:wikt:minus|minus]] (−) in front of the number. Positive numbers have no sign or a [[:wikt:plus|plus]] (+) sign in front. Zero usually has n The number of integers is [[infinite]]. The cardinal number of <math>\mathbf{Z}</math> is <math>\aleph_0</math>. The ordinal num ...

:''For the book in the Bible, see [[Numbers (Bible)]]''. ...] or [[measurement|measure]]. Depending on the field of mathematics, where numbers are used, there are different definitions: ...

* Numbers (example 3+6=9) || [[Ordinal number]]s || [[Cardinal number]]s || [[Arithmetic|Arithmetic operations]] || [[Arithmetic|Arithmeti ...