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Mathematics : Recent Questions and Answers (Page 60)

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

The Grothendieck-Serre Correspondence : Obstructions to the construction of the cyclic group of order 8 as a Galois group?

I am reading this note called as The Grothendieck-Serre Correspondence by Leila Schneps where this quote occurs:the author still recalls Serre’s unexpected reaction of spontaneous delight upon...

Asked on 12/01/2021

1 answer

Prove/disprove that $ mathbb{R}^2 / $~ is hausdorff, when: $(x_1,x_2) $~$(y_1,y_2)$ if there is $t>0$ such that $x_2 = tx_1 $ and $ty_2 = y_1$

We look at the following equivalence relation on $mathbb{R}^2$: $(x_1,x_2) $~$(y_1,y_2)$ iff there exists $t>0$ such that $x_2 = tx_1 $ and $ty_2 =...

Asked on 12/01/2021 by Gabi G

1 answer

Definition of ring of dual numbers

In an exercise from Vakil's algebraic geometry notes, he asks us to describe the set $rm Specspace k[epsilon]/(epsilon^2)$, where $k$ is a field. A comment from this...

Asked on 12/01/2021 by ponchan

1 answer

Are chain complexes chain equivalent to free ones?

Given a chain complex $A_bulletinmathrm{Ch(mathbf{Ab})}$, are there exist some chain complex $A'_bulletinmathrm{Ch(mathbf{Ab})}$ which is chain equivalent to $A_bullet$ such that $A'_p$ are all free abelian groups?...

Asked on 12/01/2021

1 answer

all prime numbers except 2 can write in the form $4npm1$

First I saw this, I was excited When I checked prime numbers and saw they are in this form. after checking more numbers I understood that every odd numbers can...

Asked on 12/01/2021 by Aligator

4 answer

Time Average Mean of X(t)=A, where A is a r.v. Ergodic vs. non-ergodic.

Time average of a sample function is defined as: $$bar{x} = langle~x(t)~rangle = lim limits_{T to infty}frac{1}{2T} int limits_{-T}^{T}...

Asked on 12/01/2021

1 answer

The complexity of finiteness

Say that a second-order sentence in the empty language, $varphi$, characterizes finiteness iff for every set $X$ we have $Xmodelsvarphi$ iff $X$ is finite. I'm interested...

Asked on 12/01/2021

1 answer

Question about step in Ahlfors' proof of Cauchy's inequality in complex analysis.

I'm reading Ahlfors' Complex Analysis. In this book, he provides the following proof of Cauchy's inequality. Using $|a -b|^2 = |a|^2 + |b|^2 - 2 Releft(aoverline{b}right)$ he establishes the...

Asked on 12/01/2021

1 answer

Numerical differentation - finding maxima

I was analyzing my data and made a graph of it ($ f(x)$) and I wanted to find the maxima of $ frac {df(x)}{dx} $. The...

Asked on 12/01/2021

0 answer

Neyman–Pearson Lemma

I am trying to wrap my head around the Neyman–Pearson lemma for simple vs simple hypothesis that is $$H_o: theta_0 hspace{19mm} H_a: theta_1$$ with the...

Asked on 12/01/2021 by Noe Vidales

1 answer

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