martini

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523 Answers

newest activity votes
4
How to solve an equation involving the whole part of a number?
4
Compact operator spectrum
4
Help with evaluating this integral
4
Solve equations using the $\max$ function
4
Computing $A^{50}$ for a given matrix $A$
4
Limit at infinity of a uniformly continuous integrable function
4
Why does a Lipschitz function $f:\mathbb{R}^d\to\mathbb{R}^d$ map measure zero sets to measure zero sets?
4
Closed and Exact forms/deRham groups
4
Translating theorem on closed/exact forms
4
Norm closure of convex hull of its set of extreme points
4
What is $\langle x + y\rangle + \langle x - y \rangle$?
4
Adjoint to the forgetful functor $U:\mathbf{Ring}\to\mathbf{AbGrp}$
3
Laplace transform of $\int_t^{+\infty}\,\psi(\tau)\,d\tau$
3
Proving $f(x) = x^2 \sin(1/x)$, $f(0)=0$ is differentiable at $0$, with derivative $f'(0)= 0$ at zero
3
Question on Contractions
3
Spectrum of T in $B(\ell^2)$
3
The G.C.D of two numbers is $23$. The other two factors of the L.C.M are $13$ and $14$.
3
sum of the residue at all poles of the rational function p/q is 0.
3
Number mapping function
3
Metric space and sequences
3
Trace is invariant under cyclic permutation even with rectangular matrices involved?
3
Prove, formally that: $\log_2 n! \ge n$ , for all integers $n>3$.
3
Calculate $\sum_{n=0}^{\infty} z^{n-2}/5^{n-1}$ for $0<|z|<5$
3
Given two adjacency matrices, how can I find if they're isomorphic?
3
Continuous functions on discrete product topology
3
Show that Y* is isometrically isomorphic with $X^*/Y^\perp$
3
Let $f:\Bbb R^{n} \to \Bbb R^{n}$ be the function defined by $f(x)=x\left \|x \right \|^{2}$ for $x \in \Bbb R^{n}$.
3
How to find the Hilbert Adjoint operator of $T(f)(t)=\int_{0}^tf(s)\ ds$?
3
If $A=(a_{ij})$ is positive semidefinite, prove that $a_{ij}^2 \leq a_{ii}a_{jj}$ for all $i \neq j$
3
Some questions about First countable space and continuous function
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