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Mathematics : Recent Questions and Answers (Page 18)

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

Do sparse graphs contain regular pairs?

An easy corollary of the Szemerédi Regularity Lemma is that dense graphs contain linear sized $varepsilon$-regular bipartite subgraphs whose density is similar to that of the parent graph. As...

Asked on 12/27/2021 by alpmu

1 answer

Brouwer's fixed point theorem and the one-point topology

In the 2-dimensional case, Brouwer's fixed point theorem (BFPT) says that every continuous function $D^2to D^2$ has a fixed point, where $D^2$ is the disk. Now fix a...

Asked on 12/27/2021 by R. Srivastava

1 answer

Definition of second derivative as a limit

I found a statement that the second derivative can be defined as: $$lim_{x to a} frac{f '(x)-f '(a)}{x-a}$$. Does this definion follow from the definition of the first derivative as:...

Asked on 12/27/2021 by kiwifruit

5 answer

Top 10 math mnemonics

If you study undergraduate medicine, mnemonics are almost indispensable - there is so much factual material to learn. I was never given any mnemonics in my time as a maths...

Asked on 12/27/2021 by almagest

5 answer

Unimodular Matrix Inverse Proof Confusion

Regarding the proof of Lemma 2: Matrix $A$ is totally unimodular if and only if the matrix $[A |I]$ is TU, I do not understand the first step...

Asked on 12/27/2021

2 answer

Distance between two lines $L_1:> x+y+z=6,> x-2z=-5$; $L_2:> x+2y=3,> y+2z=3 $

Find the distance between the two lines defined by :$$mathbb L_{1}= begin{cases} ...

Asked on 12/27/2021

3 answer

Does $lim_{(x,y)to (a,b)} frac{f(x)}{g(x,y)}$ that equals to $lim_{(x,y)to (a,b)} frac{g(x,y)}{f(x)}$ mean that the limit equals to 1?

Using L'hopital rule: $lim_{x to x_i, y to y_i} frac{x-x_i}{sqrt{(x-x_i)^2 + (y-y_i)^2}} = lim_{x to x_i, y to y_i} frac{frac{d(x-x_i)}{dx}}{frac{dsqrt{(x-x_i)^2 + (y-y_i)^2}}{dx}} = lim_{x to x_i, y to y_i}...

Asked on 12/27/2021 by Possible

3 answer

What is the maximum value of the $4 times 4$ determinant composed of 1-16?

If 1-9 is filled in the $3 times 3$ determinant, and each number appears once,then the maximum value of the determinant is $412$. For example, the following...

Asked on 12/27/2021

1 answer

Need help with a Fourier series question

I don't know if it's been asked before (if it has please give me the link), and I don't understand latex or anything so I'll write it in plain words:...

Asked on 12/27/2021

0 answer

Characterization of Integral Domains

We can show that in an Integral Domain I if $x^2=1$ then $x=pm 1$. Is the converse true? i.e if for any x in I with $x^2=1...

Asked on 12/27/2021

1 answer

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