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Mathematics : Recent Questions and Answers (Page 34)

Find answers to your questions about Mathematics or help others by answering their Mathematics questions.

Eigenvalues of a compact operator with modulus greater than $epsilon$ is finite

Consider the following fragments from Murphy's "$C^*$-algebras and operator theory": In the above proof of theorem 2.4.5., how does theorem 1.4.11 imply that the...

Asked on 12/18/2021

1 answer

How are these two sets equivalent

Given S = [0,1] and another set as R = {$$sum_{1}^{infty} frac{a_i}{10^i} $$ } where $$a_1 in {0,1,2,...,9}$$. Also the set R - {$$sum_{1}^{infty} frac{a_i}{2^i} $$ }...

Asked on 12/18/2021

1 answer

Concept about marginal probability $p(y)$to conditional probability $p(y|x)$ transformation?

I have a function like the following, $pleft( y right) = intlimits_x {intlimits_z {(Q({x^2} + y) + yz + z)dxdz} } $ Where, $Q(x) = frac{1}{{2pi }}intlimits_x^infty ...

Asked on 12/18/2021

0 answer

Extreme points of prefix sum and prefix sum of subsets.

Given an ordered set of points $P = (p_1, p_2, cdots, p_n)$, where $p_i in R^d$. The prefix sum set $S$ of $P$ is defined as...

Asked on 12/18/2021

0 answer

Completing the square of complicated expression (answer available)

I would like to rewrite the following expression $$begin{align}frac{1}{sigma_{theta}^{2}}sum_{i=1}^{I}(theta_{i}-mu)^{2} + frac{1}{sigma_{0}^{2}}(mu-mu_{0})^{2}end{align}$$ as a square with respect to $mu$. I do not know how to...

Asked on 12/18/2021 by SimpleProgrammer

0 answer

Prove $sum_{n=1}^infty frac{1}{a_n}$ is divergent if $sum_{n=1}^infty a_n$ and $sum_{n=1}^infty b_n$ are both convergent

In my practice midterm there is a multiple choice question that I thought was relatively straight forward but the solutions gave an answer that was unexpected to me. Question: If...

Asked on 12/18/2021

2 answer

Given convex differentiable function $h: R^m to R$, what is geometric interpretation of $h(x)/|nabla h(x)|$ vis à vis the level-set $h=0$?

Let $h:mathbb R^m to mathbb R$ be a convex diifferentiable function and define $C_h := {x in mathbb R^m mid h(x) = 0}$, assumed to be non-empty.Question. Given...

Asked on 12/18/2021

1 answer

Limit of integral containing $e^{iomega L(frac{pi}{2}-tau)}$ as $Lto infty$

In one Physics paper several times one encounters a limit of the following form $$lim_{Lto infty}int_0^pi e^{pm iomega L(frac{pi}{2}-tau)}int_{S^2} varepsilon(hat{x})f(tau,hat{x})dtau d^2hat{x}.$$ The integral over $S^2$...

Asked on 12/18/2021

0 answer

How to define sums of naturals in the context of set theory

I am studying Hrbacek and Jech's Introduction To Set Theory (3rd Ed), and on Section 3.4 there is the following problem: For each finite sequence of natural numbers $langle...

Asked on 12/18/2021

0 answer

If evey linear program can be transformed to an unconstrained problem, then the optimum is unbounded because the objective is linear?

Since optimization problems with linear equality constraints can be converted into an unconstrained problem this should apply for linear programs in standard form, right? But doesn't this mean that the...

Asked on 12/18/2021 by oh-nahh

1 answer

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