$f$ 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: $$...
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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...
the context i encountered this is ... algebraic-geometry intersection-theory asked jan at : red_trumpet silver badges bronze badges votes answer views intersection of a set of hyperplanes and a curve in $\mathbb{p}^ $ i have struggles with solving the following question: let $x$ be a curve in $\mathbb...
. k gold badges silver badges bronze badges vote answers views recurrences - proof of induction so i have a question below that asks for a closed formula and for me to prove the formula using induction. i believe i got the formula correct, but i'm having a hard time proving it because of the ... permutations...
answers views splitting field for $x^ - \in\mathbb{q}[x]$. i am studying the splitting field for $x^ - \in\mathbb{q}[x]$. let $f$ denote the splitting field for $x^ - \in\mathbb{q}[x]$. i found that the galois group of the extension $\mathbb{q}\subset f$ is $... abstract-algebra galois-theory asked...
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jan at : willg silver badges bronze badges votes answers views how to show a metric space is not complete in order to show that a metric space $(x, d)$ is not complete one may apply the definition and look for a cauchy sequence $\{x_n\}\subset x$ which does not converge with respect to the metric $d...