User Martín-Blas Pérez Pinilla - Mathematics Stack Exchange

120 votes

What are some counter-intuitive results in mathematics that involve only finite objects?

answered Dec 3, 2016 at 22:51

50 votes

What are the applications of functional analysis?

answered Dec 2, 2015 at 10:53

44 votes

What's your favorite proof accessible to a general audience?

answered Jan 19, 2015 at 11:34

44 votes

Limit of sequence in which each term is defined by the average of preceding two terms

answered May 12, 2017 at 6:40

42 votes

Simple theorems that are instances of deep mathematics

answered Apr 4, 2017 at 20:17

42 votes

How could we define the factorial of a matrix?

answered Jan 31, 2016 at 14:01

34 votes

Accepted

Factor $x^4+1$ over $\mathbb{R}$

answered Mar 4, 2014 at 11:45

34 votes

Examples of mathematical results discovered "late"

answered Mar 4, 2014 at 16:08

30 votes

Example of infinite field of characteristic $p\neq 0$

answered May 19, 2014 at 6:55

25 votes

Why does Wolframalpha think that this sum converges?

answered Mar 1, 2016 at 11:34

20 votes

Why Cohomology Groups?

answered Jan 21, 2016 at 18:36

18 votes

Accepted

Trouble understanding only one way implication truth

answered Feb 6, 2018 at 9:18

16 votes

Simple theorems that are instances of deep mathematics

answered Apr 4, 2017 at 20:10

16 votes

What happens when square root is performed in inequalities?

answered Feb 19, 2015 at 9:49

16 votes

What are the theorems in mathematics which can be proved using completely different ideas?

answered Jan 26, 2015 at 10:15

14 votes

What is the intuition for semi-continuous functions?

answered Sep 11, 2015 at 6:32

14 votes

Is there no formula for $\cos(x^2)$?

answered Feb 4, 2016 at 15:17

14 votes

Mathematical function that converges towards $7$?

answered Apr 25, 2017 at 20:59

13 votes

Intuitively, what does it mean that two charts are compatible?

answered Nov 22, 2017 at 10:03

13 votes

Accepted

Open source lecture notes and textbooks

answered Nov 18, 2014 at 18:46

13 votes

What physics book for aspiring theoretical physicist / pure mathematician

answered Mar 13, 2014 at 8:03

12 votes

Calculating the limit $\lim((n!)^{1/n})$

answered Mar 10, 2014 at 8:21

12 votes

Accepted

Find the limit of the sequence $(1-1/n)^n$

answered Feb 15, 2016 at 13:08

12 votes

What is the theorem that has the most proofs?

answered Apr 4, 2017 at 7:03

12 votes

Simple theorems that are instances of deep mathematics

answered Apr 6, 2017 at 7:17

11 votes

Prove that zero multiplied by zero is equal to zero.

answered Feb 23, 2016 at 7:27

11 votes

Is it possible to construct a field larger than the complex numbers?

answered Oct 6, 2015 at 7:02

11 votes

A question about limits at infinity

answered Mar 27, 2014 at 11:46

11 votes

What does the $-\log[P(X)]$ term mean in the calculation of entropy?

answered Feb 4, 2014 at 14:38

10 votes

Prove that $\lim_{n\to\infty} H_n/n = 0$ ($H_n$ is the $n$-th harmonic number) using certain techniques

answered Apr 4, 2014 at 10:12

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1,757 Answers

What are some counter-intuitive results in mathematics that involve only finite objects?

What are the applications of functional analysis?

What's your favorite proof accessible to a general audience?

Limit of sequence in which each term is defined by the average of preceding two terms

Simple theorems that are instances of deep mathematics

How could we define the factorial of a matrix?

Factor $x^4+1$ over $\mathbb{R}$

Examples of mathematical results discovered "late"

Example of infinite field of characteristic $p\neq 0$

Why does Wolframalpha think that this sum converges?

Why Cohomology Groups?

Trouble understanding only one way implication truth

Simple theorems that are instances of deep mathematics

What happens when square root is performed in inequalities?

What are the theorems in mathematics which can be proved using completely different ideas?

What is the intuition for semi-continuous functions?

Is there no formula for $\cos(x^2)$?

Mathematical function that converges towards $7$?

Intuitively, what does it mean that two charts are compatible?

Open source lecture notes and textbooks

What physics book for aspiring theoretical physicist / pure mathematician

Calculating the limit $\lim((n!)^{1/n})$

Find the limit of the sequence $(1-1/n)^n$

What is the theorem that has the most proofs?

Simple theorems that are instances of deep mathematics

Prove that zero multiplied by zero is equal to zero.

Is it possible to construct a field larger than the complex numbers?

A question about limits at infinity

What does the $-\log[P(X)]$ term mean in the calculation of entropy?

Prove that $\lim_{n\to\infty} H_n/n = 0$ ($H_n$ is the $n$-th harmonic number) using certain techniques