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when toggle format what by license comment
Dec 31, 2018 at 3:59 comment added KConrad Ah, got it. I was sure I was missing something.
Dec 30, 2018 at 17:23 history edited Robert Israel CC BY-SA 4.0
added 215 characters in body
Dec 30, 2018 at 16:36 comment added Robert Israel @KConrad That would work if $f: A \to X$, but not $A \to A$.
Dec 30, 2018 at 15:36 comment added KConrad For the same $X$ you could just use $A = \{0,1\}$.
Dec 30, 2018 at 15:18 history answered Robert Israel CC BY-SA 4.0