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Mathematics : Recent Questions and Answers (Page 26)

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

What does the "$bigwedge$" symbol mean in "$bigwedge_{j=1,ldots,M,jneq i}Delta_i(x)>Delta_j(x)"$?

What does the "$bigwedge$" symbol mean in the following? I assume it means "and". Am I right?...

Asked on 12/21/2021 by Aqee

2 answer

Find $f(t)$ such that $ int_0^{2 pi} f(t + theta) ln(2 sin frac{t}{2}) dt = frac{e^{i theta}}{e^{-i theta} - a e^{i phi}} $

I'm trying to find $f(t)$ such that $$ int_0^{2 pi} f(t + theta) ln(2 sin frac{t}{2}) dt = frac{e^{i theta}}{e^{-i theta} - a e^{i phi}} $$ where ...

Asked on 12/21/2021 by Jay Lemmon

1 answer

Proving $frac1{2pi} int_0^{2pi} frac{R^2-r^2}{R^2-2Rrcostheta+r^2} dtheta =1$ by integrating $frac{R+z}{z(R-z)}$ without residue theorem.

I was given the function: $$ frac{R+z}{z(R-z)} $$ And I was asked to integrate it around a closed contour to prove: $$frac1{2pi} int_0^{2pi} frac{R^2-r^2}{R^2-2Rrcostheta+r^2} dtheta =1$$ I've seen...

Asked on 12/21/2021 by Juan Esaul González Rangel

4 answer

What is the ordinary differential equation for double exponential summation?

Given the following ordinary differential equation (ODE) $$frac{dy}{dx} = a y$$ its general solution is $y = c e^{a x}$, where $c$ is a constant. If we...

Asked on 12/21/2021 by Wz S

3 answer

What is the value of $1 -omega^h + omega^{2h} -...+(-1)^{n-1} omega^{(n-1)h}$ when $omega$ is a root of unity?

I'm reading Ahlfors' complex analysis book. One of the problems in the book says as followsWhat is the value of $1 -omega^h + omega^{2h} -...+(-1)^{n-1} omega^{(n-1)h}$?where $h$ is...

Asked on 12/21/2021

0 answer

Why are the supremums of this linearly interpolated function equal?

Original question:Suppose $f$ is a real, continuous function defined on the closed set $E subset mathbb{R}^1$. Prove that there exists real, continuous function $g$ on $mathbb{R}^1$...

Asked on 12/21/2021

0 answer

What is the definition of "a derivation of a sequent "?

In Chapter IV. A Sequent Calculus in Ebbinghaus' Mathematical Logic, a sequent is defined as:If we call a nonempty list (sequence) of formulas a sequent,...

Asked on 12/21/2021

1 answer

Cartan Differentiable calculus. Show $g(x,y)= frac{f(x)-f(y)}{x-y}$ is differentiable at $(x_{0},x_{0})$

I'm doing problem 8 of Cartan Differentiable Calculus book. The problem says as follow: Let $f$ assume its values in a Banach space $E$, an let it be...

Asked on 12/21/2021 by Sebastian Bustos

0 answer

Proving a linear map is surjective

Suppose $V_1, dots, V_m$ are vector spaces. Prove that$mathcal{L}(V_1 times dots times V_m, W)$ is isomorphic to$mathcal{L}(V_1, W) times dots times mathcal{L}(V_m, W).$ (Note that...

Asked on 12/21/2021

1 answer

Probability of Normal Distribution

Let's say that 10 sumo wrestlers were to squeeze into an elevator that could only hold a max capacity of 2300 pounds. Let's say that the weight of the sumo...

Asked on 12/21/2021 by Frightlin

1 answer

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