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Mathematics : Recent Questions and Answers (Page 56)

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

Smoothness of discrete data

I'm having a hard time putting my question into words, so I made a few pictures.Look at this plot: Clearly, everyone will...

Asked on 12/03/2021 by murphy

3 answer

Is this a new method for finding powers?

Playing with a pencil and paper notebook I noticed the following: $x=1$ $x^3=1$$x=2$ $x^3=8$$x=3$ $x^3=27$$x=4$ $x^3=64$$64-27 = 37$ $27-8 = 19$ $8-1 = 7$$19-7=12$ $37-19=18$$18-12=6$I noticed a pattern for...

Asked on 12/03/2021

4 answer

Checking a bound on the Stieltjes transform from Terence Tao's notes

I'm trying to check a bound on Stieltjes transform of a probability measure, that's given in equation (2.92) on P. 170 in Terence Tao's notes "...

Asked on 12/03/2021

2 answer

Homology of infinite Koszul complex tensored with an injective module vanishes

Given a commutative noetherian ring $A$ and an element $ain A$, we denote by $A[a^{-1}]$ the localisation of $A$ at ${1,a,a^2,cdots}$. The infinite Koszul complex...

Asked on 12/03/2021

1 answer

Anti-symmetric representation of $SO(2n)$ to $SU( n)$

in p. 424 of this book, it says that$$n(2n-1) text{ anti-sym rep of } SO(2n)$$$$ton^2-1 text{ adjoint-rep of } SU( n)$$...

Asked on 12/03/2021

0 answer

Symplectomorphism and Hodge decomposition

Let $X$ be some holomorphic symplectic manifold. This means we have choosen some $omegain H^{2,0}(X).$ If $f:Xrightarrow X$ is a symplectomorphism, then we have by definition...

Asked on 12/03/2021

0 answer

Proving that $f + g, f cdot g$, and $f/g$ are continuous using neighborhoods

This is Exercise 1 from Section 1.2, page 9, of Topology and Groupoids by Brown. I paraphrase portions of the book to hopefully improve clarity. I found questions such as...

Asked on 12/03/2021

1 answer

Why random variables is a function? It seems that it violates the definition of function.

I am watching Lecture 5 of MIT 6.041 Probabilistic Systems Analysis and Applied Probability. In the lecture, Professor said Random Variable is a function that maps elements...

Asked on 12/03/2021

2 answer

An inequality for two positive series

Let ${ a_n }_{n in mathbb{N} }$ and ${ b_n }_{n in mathbb{N} }$ be two non-increasing sequences of positive numbers, $$sum _{n=1} ^infty a_n ...

Asked on 12/03/2021 by Sinusx

1 answer

Computing the matrix differential/derivative of the matrix$rightarrow$scalar function $log det(BCB^T)$

I am trying to learn how to replicate the matrix calculus done in the following paper: https://arxiv.org/pdf/1811.11433.pdf. To learn how to do this, I a using...

Asked on 12/03/2021 by xedg

1 answer

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