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His usage is correct.

Cardinality refers to the size of any set. This includes finite, countable, and uncountable sets.

The sequence of cardinal numbers is transfinite: 0, 1, 2, ... , n, ..., aleph_0, aleph_1, ...

http://en.wikipedia.org/wiki/Cardinality

http://en.wikipedia.org/wiki/Cardinal_number

The OP is correct. Cardinality in mathematics is the number of elements in a set[1]. What you are probably referring to is the concept of cardinal numbers[2]. I guess you can skip the smug tone.

[1] http://en.wikipedia.org/wiki/Cardinality [2] http://en.wikipedia.org/wiki/Cardinal_number

He can't even claim that. Cardinal numbers include the finite cardinals, after all.

> no need to get fancy with words you don't know the meaning of.

If you want to write things that leave no room for you being mistaken, it is a good idea to double check what you are saying.

https://www.google.com/webhp?#hl=en&q=cardinality&tb...

The irony of your crushingly ignorant post nearly killed me.