
How Can Some Infinities Be Bigger Than Others?
The Joy of Why
The Countable Integers
Mathematicians use countable to mean something a little different than that. It just means that you can assign a natural number to each element of the set so that no natural to get number gets used twice. So it's something can be countable and infinite. And infinite. The integers including the negative the negatives of the natural numbers are also countable.
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