Reputation
11,092
Top tag
Next privilege 15,000 Rep.
Protect questions
Badges
2 22 48
Impact
~220k people reached

May
18
awarded  Notable Question
May
16
comment Properties of Intersection of Sets
@GregoryGrant: I know what $2^A$ means, basically because I learned it here on math.SE. Before that, I didn't (but I definitely knew what a power set is, and knew the notation $P(A)$ for it).
May
16
comment Properties of Intersection of Sets
@GregoryGrant: Then you would think wrong.
May
16
comment Properties of Intersection of Sets
@GregoryGrant: Not necessarily more people, just another set of people.
May
16
revised Vector Spaces: Redundant Axiom?
added 5 characters in body
May
15
comment What function satisfies $f(x)+f(−x)=f(x^2)$?
Actually the question doesn't specify the domain. So also the function $f:\{-1,1\}\to\{0,1\}$ with $f(-1)=0$ and $f(1)=1$ satisfies the given requirements.
May
15
comment Notation problem in integration: write $dx$ or ${\mathrm{d}}x$?
@ChristianBlatter: What's wrong with $\sin n\pi$? I'm no mathematician, and I don't see anything wrong with it.
May
15
answered What are the “building blocks” of a vector?
May
15
reviewed Reject Interior of closed ball
May
15
revised Riemann's genus???
Marked quote as such
May
14
revised Graphing a parabola
MathJax
May
14
revised If $ab=ba$, Prove $a^2$ commutes with $b^2$
added 295 characters in body
May
14
answered If $ab=ba$, Prove $a^2$ commutes with $b^2$
May
14
comment What should be the intuition when working with compactness?
This is a link-only answer. Link-only answers are frowned upon because the link can (and indeed, over sufficient time is almost guaranteed to) become invalid. For example, the file you link to is obviously on the personal homepage of someone at UCLA with the local login name "tao" (the form of the URL is a dead giveaway for that). So what do you think happens to this link if that person some day moves to another university (or retires), and his user account on UCLA's servers gets deleted?
May
14
comment Prove that $\partial A$ is a cutset of connected $X$ if $\operatorname{Int}(A)$ and $\operatorname{Int}(X - A)$ are nonempty
Hint: $\partial A = \partial(X-A)$
May
13
awarded  Good Answer
May
13
awarded  Nice Answer
May
12
answered Is an irrational number odd or even?
May
12
answered How to Formulate this Linear Algebra Fact in a Coordinate Free way?
May
9
answered Turing Machine Halting problem