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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
Aug
21
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 $dim(X)$?