5,107 reputation
31852
bio website iaz.uni-stuttgart.de/…
location Stuttgart, Germany
age 28
visits member for 3 years, 5 months
seen 35 mins ago

Post-Doc working in representation theory


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Jan
16
reviewed Leave Open Finding original function of $1/x$ by using a step function
Jan
16
reviewed Leave Open Tricky probability…
Jan
16
reviewed Approve Finding original function of $1/x$ by using a step function
Jan
9
reviewed Close Questions about multiple zeta values
Jan
9
reviewed Close Specific question on imaginary quadratic field
Dec
21
reviewed Close What are some mathematically productive ways to waste time?
Dec
21
reviewed Close If $|f|+|g|$ is constant then each of $f, g$ is constant
Dec
21
reviewed Close How to continue on proving that rank (A+B) ≤ Rank A + Rank B?
Dec
21
revised For a simple nonabelian group every automorphism with $xf(x)=f(x)x$ is trivial.
more descriptive title, LaTeX
Dec
21
reviewed Leave Open Permutation of positive real numbers
Dec
21
reviewed Leave Open Why do we need to learn Set Theory?
Dec
21
reviewed Close Evaluating a complex integral using the Cauchy integral formula
Dec
21
reviewed Leave Open Borel measurable functions $f:[0,1]\to[0,\infty)$ which cannot be expressed as pointwise limit of nondecreasing sequence of step functions
Dec
21
awarded  Constituent
Dec
8
awarded  Caucus
Nov
26
awarded  Good Question
Nov
3
comment How to compute $Ext_A^{1}(S_1, S_2)$ and $Ext_A^{1}(S_2, S_1)$?
$\operatorname{dim}\operatorname{Ext}^1(S_i,S_j)=$ number of arrows $i \to j$
Nov
2
comment How to compute $Ext_A^{1}(S_1, S_2)$ and $Ext_A^{1}(S_2, S_1)$?
In fact $A$ has infinite projective dimension, not projective dimension $1$.
Oct
21
awarded  Revival
Oct
12
comment Suppose $A$ is an invertible matrix. Prove that $det(A^{-2}) = 1/(det(A))^2$
Yes, if you already know that $\operatorname{det}(AB) =\operatorname{det}(A)\operatorname{det}(B)$.