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 Sep 25 comment Is every injective function invertible? which is to say, it is invertible on its image. $f^{-1}: f(A) \longrightarrow A$. May 23 comment Tangent of a Straight Line @J.Roberts "I think of a tangent intersecting the equation at one point," and it does... one point and a line of points. May 23 comment How is a symmetric group the subgroup of the group of isometries of three-dimensional space? So you have an isomorphism from $S_4$ to "rotations of the cube". How are you supposed to consider $S_4$ other than as rotations of the cube? This question seems a little vague! Mar 22 comment Commutator subgroup - or? Is there a typo here, $\alpha(a^{-1})a$ is just $\alpha$...? Nov 16 awarded Citizen Patrol Oct 27 comment find $\dim X\times \mathbb{P}^{2}$ @spencer What's the definition of times? May 12 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'?) Feb 21 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 Feb 21 suggested approved edit on $\epsilon$-$\delta$ proof that $f(x) = x^3 /(x^2+y^2)$, $(x,y) \ne (0,0)$, is continuous at $(0,0)$ Nov 14 comment Is this an open problem? I don't see why we only consider primes? oeis.org/A069035 Nov 14 comment Is this an open problem? @Salahuddin not really, just a subsequence of this: oeis.org/A069035 Oct 23 revised The role of dual space of a normed space in functional analysis spelling, and some slight rewording. Oct 23 suggested approved edit on The role of dual space of a normed space in functional analysis Sep 21 awarded Custodian Sep 16 revised Proving the trigonometric identity used align formatting Sep 16 suggested approved edit on Proving the trigonometric identity Aug 23 awarded Disciplined Aug 21 comment Why $\mathbb{Z}_p^*$ is a cyclic group? Um, $\mathbb{Z}_2 \times \mathbb{Z}_3$ is abelian, but $2\nmid 3$. Aug 21 comment Why $\mathbb{Z}_p^*$ is a cyclic group? Please could you elaborate on the final sentence? Aug 21 awarded Critic