33,427 reputation
12041
bio website jungenschaft-hohenstaufen.de
location Berlin, Germany
age 33
visits member for 2 years, 10 months
seen 9 hours ago

Jul
16
reviewed Reviewed How can i prove that a cartesian product is isomorphic to another cartesian product
Jul
16
revised How can i prove that a cartesian product is isomorphic to another cartesian product
TeXification
Jul
16
answered A question about reflexive spaces
Jul
16
answered A function f(x) that increases from 0 to 1 when x increases from 0 to infinity.
Jul
16
comment How to prove this elementary “ interpolation” inequality?
Sure you want both exponents to be $1-\theta$?
Jul
16
comment Well-Posedness PDE of the Form $\partial_t u = P(\partial_x) u$ for a Polynomial $P$
@SmileySam That's orthogonality, see above.
Jul
16
revised Well-Posedness PDE of the Form $\partial_t u = P(\partial_x) u$ for a Polynomial $P$
added 511 characters in body
Jul
16
answered $R^{(I)} \cong K \oplus H$ where $R^{(I)}$ is free but $K$ is not free
Jul
16
comment An Uncountable language , A Model of $\mathbb{N}$, A Problem.
But $\Phi \subseteq T$ (by Observation 2). Don't mix up $\bigcup_{n < \omega} \{\phi_n\} = \{\phi_n \mid n < \omega\}$ which asserts that for any $n$ there is some $x$ such that $x$ is divisible by the primes less than $x$ and the assertion $\exists x\, P_{\mathbb P}(x)$ which wants the same $x$ for all $n$.
Jul
16
answered Well-Posedness PDE of the Form $\partial_t u = P(\partial_x) u$ for a Polynomial $P$
Jul
16
answered Rewriting integrals over spheres involving $1/|x|$
Jul
16
answered A question on linearity of inner product
Jul
16
comment Dual of $l^\infty$ is not $l^1$
Yes. But the restriction map $(\ell^\infty)^* \to c_0^*$ is not one-to-one, note for example that the functional $g$ given above restricts to $0$.
Jul
16
answered Given Tf(x), find the equivalent operator m(k)f^(k) in the Fourier transform sense.
Jul
16
answered Dual of $l^\infty$ is not $l^1$
Jul
16
reviewed No Action Needed Calculating a Factorial Base Representation
Jul
16
reviewed Reviewed Help with a trig-substitution integral
Jul
16
revised Help with a trig-substitution integral
added 22 characters in body
Jul
16
reviewed No Action Needed continuous bayes formula
Jul
16
revised $f$ unbounded in $\mathbb{R}$ implies it cannot be in $L^2(\mathbb{R})$.
added 455 characters in body