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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...

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Mathematics Asked by R. Srivastava on 2 years ago

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:...

5

Mathematics Asked by kiwifruit on 2 years ago

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...

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Mathematics Asked by almagest on 2 years ago

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...

2

Mathematics Asked on 2 years ago

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} ...

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Mathematics Asked on 2 years ago

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}...

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Mathematics Asked by Possible on 2 years ago

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...

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Mathematics Asked on 2 years ago

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:...

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Mathematics Asked on 2 years ago

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...

1

Mathematics Asked on 2 years ago

Unique solution to an Initial Value Problem

I'm trying to find if the solution of the following initial value problem is unique.begin{align}y' &= 3 (y^{2/3})\y(0) &= 0end{align}I have tried with...

2

Mathematics Asked on 2 years ago

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