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seen Jul 14 at 4:38

Nov
25
revised Proving that if $a_n\in\mathbb{Z}$ for all $n$ then it's limit is also in $\mathbb{Z}$?
added 224 characters in body
Nov
7
revised Proving a set of functions from $\mathbb{N}$ to $\{1,0\}$ is countable
added 300 characters in body
Nov
6
revised Proving a set of functions from $\mathbb{N}$ to $\{1,0\}$ is countable
added 417 characters in body
Nov
4
revised proving a simple function is bijective
expanded the question to what it was originally supposed to be
Nov
2
revised In field ($F, +, \cdot$) , how can I prove $x^2 =1\implies x=1,-1$
added 236 characters in body