33,427 reputation
12041
bio website jungenschaft-hohenstaufen.de
location Berlin, Germany
age 33
visits member for 2 years, 11 months
seen Jul 22 at 22:22

Jul
17
reviewed No Action Needed What is the count of the strict partitions of n in k parts not exceeding m?
Jul
17
reviewed Leave Open How to find this integral $\int_{0}^{1}\ln\ln\bigl(1/x+\sqrt{(1/x^2)-1}\,\bigr)dx$
Jul
17
reviewed Close how to derive ecomomics demand and supply fuctions from a given data
Jul
17
reviewed Leave Open Inequality with mean value theorem with convex function
Jul
17
reviewed Leave Open “How strong is $\Diamond_\kappa^+$?”
Jul
17
answered A question of topology.
Jul
17
comment (Theorem) If $G$ is a simple group of odd order , then $G \cong \mathbb Z_p$ for some prime $p$.
Feit-Thompson gives that $G$ is solvable, we hence have $G' \lhd G$. As $G$ is simple, $G' = 1$, hence $G$ is abelian. But an abelian simple group is of prime order.
Jul
17
comment Stone's theorem
Seperability isn't needed, Stone's theorem holds true also for non-seperable Hilbert spaces. An the OP asks for the following: Given $U$, find a unitary group $U(\cdot)$ such that $U(1) = U$.
Jul
17
answered A problem in the proof of Jordan decomposition theorem
Jul
17
reviewed Leave Open Nonhomogeneous equations
Jul
17
reviewed Close $i^{-1} F$ a sheaf if and only if $\varinjlim_{ U \subseteq X \text{ open}, ~ x,y \in U } F(U) \to F_x \times F_y$ is an isomorphism
Jul
17
reviewed Close Advantage of Bootstrapping Confidence Intervals over Standard Error
Jul
17
reviewed Leave Open Finding first few terms in power series expansion of general solution
Jul
17
reviewed Leave Open A question of real analysis.
Jul
17
reviewed Close Probability problem (reliability)
Jul
17
reviewed Leave Open Compute $\int_1^e \frac{dx}{x(x+(\ln x)^2)}$
Jul
17
reviewed Looks OK Closed form for the sum: $\sum_{n=1}^{\infty}\frac{1}{n(n + 1/3)}$
Jul
17
reviewed Looks OK Resources for learning integral calculations
Jul
17
reviewed Reject suggested edit on Is an o-minimal structure equivalent to a totally ordered set?
Jul
16
comment Show that these matrices are congruent.
Why does $u^{1/2}$ exist? Oh I overlooked the "positive" ... the question is about a general field.