12,110 reputation
13260
bio website
location
age 29
visits member for 4 years, 6 months
seen 8 hours ago

Jan
23
revised Integral defined on space of matrices
deleted 1 character in body
Jan
23
answered Solve this limit $\lim_{x\to0} (1+x)^{\frac{1}{x}}$
Jan
21
revised Spectrum of convolution operator
added 11 characters in body
Jan
21
comment What will be $F'(x)?$
No quite. I think you've lost a minus sign along the way.
Jan
21
comment Reversing minimax function
What are your assumptions on the function $f$? You seem to be abusing notation writing $f(x)$ as well as $f(a,b,x)$.
Jan
21
revised Reversing minimax function
edited body
Jan
21
answered For a commutative ring $R$, why does $1-ab$ being a non-unit leads to $1-ab \in M$ for some maximal ideal $M$?
Jan
21
answered What will be $F'(x)?$
Jan
21
comment Does every group have a lie algebra?
Lie groups have Lie algebras. $(\mathbb C,\cdot)$ is not a group.
Jan
20
comment Prove that there are infinitely many real numbers.
What is the question?
Jan
20
answered Expected value of $X^2$
Jan
15
comment Existence of a canonical surjective homomorphism on tensor products
Because in the second tensor product you divide out more relations than in the first. (The map is of course given by $m\otimes n\mapsto m\otimes n$.)
Jan
14
comment Showing $d(x,y) = \frac{|x-y|}{1+|x-y|}$ is a distance.
I seems like concavity of the function $x\mapsto\frac{1}{1+x}$ on $[0,\infty)$ would be useful.
Jan
3
comment Is the set of all real valued continuous functions on $\mathbb R$ with compact support complete?
$\phi$ should be non-zero, otherwise $f$ will have compact support.
Jan
3
comment Need help with partial derivative: product rule
It looks like you forgot to divide by the square of the denominator of $f$.
Jan
3
answered Need help with partial derivative: product rule
Jan
3
accepted What is the decategorification of a triangulated category?
Jan
3
comment What is the decategorification of a triangulated category?
Indeed, that seems to be the correct formulation of the additional structure. In other words, there is a natural transformation $\lvert\mathcal T\rvert\to\mathrm{K}_0(\mathcal T)$.
Dec
19
awarded  Constituent
Dec
18
revised Is this a metric on matrices?
deleted 21 characters in body; edited title