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Mathematics : Recent Questions and Answers (Page 76)

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

Computing the dual change of coordinate matrix $[T^t]^{beta *}_{gamma *}$

I am trying to understand the computation of $[T^t]^{beta *}_{gamma *}$ from Friedberg linear algebra. $T:P_1(R)→ R^2$ and $T(p(x))=(p(0),p(2))$$beta$ and $gamma$ are the...

Asked on 11/19/2021 by Ruochan Liu

2 answer

A prime ideal is either maximal right ideal or small right ideal.

Definition:- A right ideal $I$ of a ring $R$ is called small right ideal if $I+J=Rimplies J=R$ for any right ideal $I$ of $R$. My...

Asked on 11/19/2021 by Nirbhay Kumar

1 answer

How to evaluate $int_{0}^{infty} x^{nu} frac{e^{-sqrt{x^2+a^2}}}{sqrt{x^2+a^2}} , dx$?

$$int_{0}^{infty} x^{nu} frac{e^{-sqrt{x^2+a^2}}}{sqrt{x^2+a^2}} , dx$$ Is it possible to calculate this for $a>0$ and $nu=0, 2$ ? I think the result seems to include exponential integral function,...

Asked on 11/19/2021 by Ui-Jin Kwon

1 answer

Geometric sequences , cones and cylinders

I’ve come across an interesting problem where a square is constructed within a circle , we then construct the circle inscribed within the previous square and so on. The idea...

Asked on 11/19/2021

1 answer

Evaluate $f^{prime prime}(z)$ using Cauchy's inequality.

Suppose an entire function $f$ satisfies $|f(z)| leq pi|z|$ for all $z in mathbb{C}$. (a) Evaluate $f^{prime prime}(z)$ for each $z in mathbb{C}$ using Cauchy's...

Asked on 11/19/2021

2 answer

Calculation of $left(frac{1}{cos^2x}right)^{frac{1}{2}}$

Shouldn't $left(frac{1}{cos^2x}right)^{frac{1}{2}} = |sec(x)|$?Why does Symbolab as well as my professor (page one, also below) claim that $left(frac{1}{cos^2x}right)^{frac{1}{2}} = sec(x)$, which...

Asked on 11/19/2021 by underdisplayname

1 answer

Need help with even number problem

Problem: A random non-zero positive even integer, $E$ is picked. We can call the bracketed section in the statement $E = {Acdot2^n}$ the factored form of this number...

Asked on 11/19/2021 by Dddb

2 answer

Showing an infinite sequence is constant under some condition

Let $a_1,a_2,...$ be an infinite sequence of positive real numbers such that for each positive integer $n$ we have $$frac{a_1+a_2+..+a_n}ngesqrt{frac{a^2_1+a^2_2+...+a^2_{n+1}}{n+1}}.$$ Prove that the sequence ...

Asked on 11/19/2021

1 answer

Is $mathbb{Q};cong; (prod_{ninomega}mathbb{Z}/p_nmathbb{Z})/simeq_{cal U}$?

Let ${cal U}$ be a non-principal ultrafilter on $omega$, and for each $ninomega$, let $p_n$ denote the $n$th prime, that is $p_0 = 2,...

Asked on 11/19/2021

3 answer

Question about dominated convergence: showing $1_{[tau, tau_j)}$ tends to $0$ a.e. for an approximating sequence of stopping times $tau_j$.

This is part of a proof from René Schilling's Brownian Motion. Here, $f$ is a function in $mathscr{L}_T^2$, which is closure of the simple processes $mathscr{S}_T$ in...

Asked on 11/19/2021

1 answer

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