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Questions of the kind "What's the name for a X that satisfies property Y?"

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Referring to the countability of $\Bbb Q$ as "Cantor's first diagonal argument"

I had a discussion with one of my students, who was convinced that they could prove something was countable using Cantor's diagonal argument. They were referring to (what I know as) Cantor's pairing f …
Tristan vd Vlugt's user avatar