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Mar
4
revised Hard Olympiad Proof Problem
added 50 characters in body
Mar
4
answered discrete family of sets
Mar
4
answered The characteristics of a subfield of a field is same as that of the field.
Mar
4
comment Interesting number theory question(divisibility)
Oh yeah, the other one is for quadratic residues right? Thank you.
Mar
4
revised Interesting number theory question(divisibility)
added 3 characters in body
Mar
4
answered Hard Olympiad Proof Problem
Mar
4
answered Interesting number theory question(divisibility)
Mar
4
asked Every closed subset of $\mathbb R^2$ is the frontier of a set?
Mar
4
awarded  algebra-precalculus
Mar
4
awarded  discrete-mathematics
Mar
4
comment $\mathbb Z_p^*$ is a group iff $p$ is prime
oh yeah. thanks.
Mar
4
revised $\mathbb Z_p^*$ is a group iff $p$ is prime
edited body
Mar
4
comment online courses and books covering the theory of cellular automata
mathoverflow.net/a/157025/24478
Mar
4
comment The Square Root of a Positive Irrational is Irrational
Good point, I changed it for $o$. thanks.
Mar
4
revised The Square Root of a Positive Irrational is Irrational
edited body
Mar
4
comment $\mathbb Z_p^*$ is a group iff $p$ is prime
yeah, I forgot to add the asterisk. Thanks for noticing.
Mar
4
answered $\mathbb Z_p^*$ is a group iff $p$ is prime
Mar
4
answered The Square Root of a Positive Irrational is Irrational
Mar
4
answered Orders, Groups, and Cyclic Groups
Mar
3
comment How to tell where parentheses go in functional notation?
It looks like it is $f(z)=\ln(r)+i\theta$. Because otherwise the lack of parenthesis is inexcusable.