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$t: v ightarrow w$, $s: w ightarrow z$ be linear. if $s*t$ is an isomorphism, then $t,s$ are isomorphisms. i am told that this is in general ... linear-algebra reference-request linear-transformations asked yesterday beacon bronze badges votes answers views near spin expectation value inthe d classical...
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yesterday waney bronze badges vote answers views -cycle and eventually fixed point at periodic point problem given $f(x) = x^ - $. prove that the basin of attraction of the -cycle $\{ \}$ consists of all numbers inthe interval $\left( rac{ -\sqrt } , rac{ +\sqrt } ight)$, except for the points ......
$v_ ,v_ ,\ldots,v_k\in\mathbb{r}^n$ such that for each $i$ the inequality $|v_i|\... combinatorics vectors discrete-geometry asked days ago richrow silver badges bronze badges vote answer views on a certain sphere-packing problem suppose we have a closed ball $s$ of radius $r$ centered at the origin...
ongoing sino-american trade war may bring about a shift inthe global trading patterns due to spillover effects and displacement of the bilaterally traded commodities to other countries. the first set of tariffs was imposed by the us in january, 2018 when the us hiked tariffs on products which were a...
$f$ is continuous on $\mathbb{r}^ $. well, my problem is ... real-analysis continuity asked yesterday besmath bronze badges votes answers views computing the norm of a continuous functional over $c([ ])$ consider a functional $c([ ])\ni f \mapsto f( ) \in \mathbb{r}$. let the norm on $c([ ])$ be: $$...
mathematical-physics asked hours ago thibaut demaerel silver badges bronze badges votes answer views prove the compactness of an operator in a hilbert space i'm trying to prove the following statement: let $\{m_k, k \in \mathbb{n} \}$ be a countable collection of finite dimensional subspaces of a hilbert...