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Mathematics : Recent Questions and Answers (Page 66)

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

Question regarding measure theory and Lebesgue integral

Let's say we are given an integral $$int_{-infty}^{infty} f(x)g(x)dx$$ (Notation is Riemannian but we can see this as Lebesgue integral.) Sometimes it's convenient for us to see this as...

Asked on 11/26/2021

0 answer

Scaling of a matrix and its impact on eigen values

Given a positive definite symmetric matrix $A$ of size $n times n$ where $n$ is even, with known eigen values and eigen vectors, what can we say...

Asked on 11/26/2021

0 answer

Is there any infinitesimal number both definable and computable?

Suppose we take for example the smallest number strictly greater than 0 (which in the conventional real number system realm doesn't exist but in some other number systems does (e.g...

Asked on 11/26/2021 by user403504

1 answer

Prove that if $p$ and $q$ are rational number with $p < q$ then there exist $ r in A$ such that $p le r le q $

I have the following problem. Let $A$ be the set of rational numbers which have the form ${dfrac{k}{2^n}}$ for some $ k in mathbb{Z} $ and ...

Asked on 11/26/2021 by npdfe

1 answer

Prove that $|a + b| = |a| + |b| iff aoverline{b} ge 0$

I'm reading a complex analysis book. In this book, the author establishes the following statementIf $a,b in mathbb{C}$, then $|a + b| = |a| + |b| iff...

Asked on 11/26/2021

4 answer

Let $G$ be a finite nilpotent group and $G'$ its commutator subgroup. Show that if $G/G'$ is cyclic then $G$ is cyclic.

So I thought the cleanest way to do this was to simply prove $G' = 1$ since if $G$ is cyclic $G' = 1$ and then ...

Asked on 11/26/2021

3 answer

Proof of fourier transform expression

I want to split $ J= int_0^{infty} e^{ik_ax}f(x) dx$ into a real and imaginary part as follows: $ J= int_0^{infty} e^{ik_ax}f(x) dx = frac{1}{2} widetilde{f}(k_a) +frac{1}{2pi i}...

Asked on 11/26/2021

0 answer

Why power set of $Omega$ (set of all outcomes) can't always be used as field in probability space ($Omega,mathcal{F}, P$)?

I guess it's because, for example, when $Omega=mathbb{R}$ (denote its size as $|mathbb{R}|$), its power set would be too large, with its size equals $2^{|mathbb{R}|}$, and though...

Asked on 11/26/2021

0 answer

Topological proof for the unsolvability of the quintic

Sorry, but in order to ask the question, you will have to view this videohttp://drorbn.net/dbnvp/AKT-140314.php.Here a topological proof for the unsolvability of the quintic is...

Asked on 11/26/2021

1 answer

Question about convergence of a sum of integrals as mesh tends to $0$ using continuity

Below is a proof on approximating stochastic integrals for mean-square continuous processes in René Schilling's Brownian Motion. My question is: How do we get the last convergence to $0$...

Asked on 11/26/2021

1 answer

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