35,423 reputation
12443
bio website jungenschaft-hohenstaufen.de
location Berlin, Germany
age 33
visits member for 3 years, 5 months
seen 2 days ago

Aug
7
answered convex weak* sequentially closed subset of a separable Banach space implies weak* closed
Aug
7
comment Space of bounded functions vs. bounded space of functions.
@BenSouthworth If $\sup_{f \in B} \sup_{x\in \mathbb R} |f(x)|$ is bounded, all $f \in B$ are bounded functions. But on the other hand, all $f$ being bounded does not suffice! Let $B = \{f_n \mid n \in \mathbb N\}$, where $f_n \colon x \mapsto n$ is the constant-value-$n$-function. Then each $f_n$ is bounded, but $B$ is unbounded.
Aug
6
answered Space of bounded functions vs. bounded space of functions.
Aug
6
reviewed Close translating vectors in polar coordinates to the complex plane
Aug
5
answered Two functions that map from $R^5$ to $R^2$.
Aug
5
answered Riemann integral of a certain function
Aug
5
revised Factoring a problem. What is the other factor?
deleted 36 characters in body
Aug
5
reviewed Looks OK Deriving FTC from the generalized Stokes.
Aug
5
reviewed Looks OK Simplify and Combine radicals/exponents
Aug
5
reviewed Leave Closed Show without expanding that the two determinants are equal
Aug
5
answered Prove that the set $C = \{x \in\Bbb R : ax\le b\}$ is convex
Aug
5
answered Prove that if $T=T^*$ and $\sigma(T)=\{\lambda\}$, then $T=\lambda I$
Aug
5
answered Example: Algebraic Multiplicity vs Geometric Multiplicity
Aug
5
answered Diagonalizability of a certain $4\times4$ matrix
Aug
5
answered From the given measure $\mu,$ how to construct another measure $\mu^{\ast}$; so that $d\mu^{\ast}(y)= (1+y^{2})d\mu(y)$?
Aug
5
reviewed No Action Needed Minimum excluded ordinal
Aug
5
reviewed Reviewed Prove ${\large\int}_0^\infty\frac{\ln x}{\sqrt{x}\ \sqrt{x+1}\ \sqrt{2x+1}}dx\stackrel?=\frac{\pi^{3/2}\,\ln2}{2^{3/2}\Gamma^2\left(\tfrac34\right)}$
Aug
5
answered The existence of conditional expectation with respect to a sub-$\sigma$-algebra
Aug
5
answered Free object in category of groups.
Aug
5
reviewed Reviewed Distribution of a product of random Gaussian matrices and vectors