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 Mar22 comment Commutator subgroup - or? Is there a typo here, $\alpha(a^{-1})a$ is just $\alpha$...? Nov16 awarded Citizen Patrol Oct27 comment find $\dim X\times \mathbb{P}^{2}$ @spencer What's the definition of times? May12 comment Should every group be a monoid, or should no group be a monoid? Is Definition 2 also incorrect/insufficient (for similar reasons to Definition 2'?) Feb21 revised $\epsilon$-$\delta$ proof that $f(x) = x^3 /(x^2+y^2)$, $(x,y) \ne (0,0)$, is continuous at $(0,0)$ is also a function of y Feb21 suggested approved edit on $\epsilon$-$\delta$ proof that $f(x) = x^3 /(x^2+y^2)$, $(x,y) \ne (0,0)$, is continuous at $(0,0)$ Nov14 comment Is this an open problem? I don't see why we only consider primes? oeis.org/A069035 Nov14 comment Is this an open problem? @Salahuddin not really, just a subsequence of this: oeis.org/A069035 Oct23 revised The role of dual space of a normed space in functional analysis spelling, and some slight rewording. Oct23 suggested approved edit on The role of dual space of a normed space in functional analysis Sep21 awarded Custodian Sep16 revised Proving the trigonometric identity used align formatting Sep16 suggested approved edit on Proving the trigonometric identity Aug23 awarded Disciplined Aug21 comment Why $\mathbb{Z}_p^*$ is a cyclic group? Um, $\mathbb{Z}_2 \times \mathbb{Z}_3$ is abelian, but $2\nmid 3$. Aug21 comment Why $\mathbb{Z}_p^*$ is a cyclic group? Please could you elaborate on the final sentence? Aug21 awarded Critic Aug21 comment find $\dim X\times \mathbb{P}^{2}$ What have you tried so far? Isn't $dim(X \times Y)=dim(X)+dim(Y)$? So aren't you really only asking what is $dim(X)$? Aug21 awarded Commentator Aug20 comment Why isn't math on the sine of angles the same as math on the angles in degrees? @nbubis In which case linear does not imply additive, see examples above. :)