35,270 reputation
12443
bio website jungenschaft-hohenstaufen.de
location Berlin, Germany
age 33
visits member for 3 years, 3 months
seen 2 days ago

Aug
8
revised Find an equivalent to $(p\lor q) \to (p \lor r)$
edited tags
Aug
8
reviewed Close Can we expect to find $r,$ large enough, so, $\sum_{n\in \mathbb Z} \frac{(1+n^{2})^{s}}{1+(n-y)^{r}}\leq C (1+y^{2})^{s} $ for all $y\in \mathbb R$?
Aug
8
reviewed Leave Open How can I find this end, more than one way?
Aug
8
reviewed Leave Closed is it possible for some infinite cardinality of numbers to exhibit $x \cdot x = 0$ while other numbers $y \cdot y \neq 0$?
Aug
8
comment Separability of the space of bounded uniformly continuous functions
Passing through the Stone-Cech compactification does not help in general, as the latter is not metrizable in general, and hence $C(\beta X)$ fails to be seperable (note, that for $K$ compact Hausdorff $C(K)$ is separable iff $K$ is metrizable).
Aug
8
reviewed Reject How much gas does a car use to carry its own gas?
Aug
8
reviewed Leave Open How prove that $\max(|f(1)|,|f(2)|,|f(3)|,|f(4)|)\geq \frac{1}{2}$ if $f(x) = \cos(Ax)+\cos(Bx)$?
Aug
8
reviewed No Action Needed Sum of products of binomial coefficients
Aug
8
reviewed Looks OK dimension of $\mathbb{C}$ over $\mathbb{Q}$
Aug
8
reviewed Edit Brackets with a summation
Aug
8
revised Brackets with a summation
replaced image by TeX.
Aug
8
reviewed Close What is the oldest open problem in geometry?
Aug
8
reviewed Leave Open $E \subseteq [0, 1]$, $m(E) > 0$. Show that there are $\alpha$ and $\beta$ such that $\alpha, \alpha + \beta, \alpha + 2\beta \in E$.
Aug
8
reviewed Leave Open Show that $ \frac{2+\ln a }{2}\lt\frac{a-1}{\ln a} \lt \frac{1+a}{2}$ becomes $ \frac{2(a-1)}{a+1}\lt\ln a \lt -1 + \sqrt{2a-1}$
Aug
8
reviewed Leave Open a theory $(x,+,\cdot)$ satisfies $x \cdot x=0$ and $x \cdot (y \cdot z)=(x\cdot y)\cdot z$
Aug
8
reviewed Close Prove this linear map $(Tf)(x) = x^2f(x)$ is injective and find the null space
Aug
7
revised What can be the possible rank of adjoint of matrix of order n?
This is not (functional-analysis)
Aug
7
reviewed Looks OK What is the maximum y-value of the following function?
Aug
7
reviewed Close Finding parametric distance on quadratic curve from given $(x,y)$ point
Aug
7
reviewed Leave Open How to find rank of linear operator T on inner product space