User Kevin Buzzard - Mathematics Stack Exchange

227 votes

2 answers

18k views

Proving you can't make $2011$ out of $1,2,3,4$: nice twist on the usual

asked Dec 17, 2011 at 12:40

41 votes

2 answers

2k views

Any positive integer solutions to $x^6+y^{10}=z^{15}$?

asked Mar 25, 2011 at 21:11

39 votes

3 answers

6k views

Where does the term "integral domain" come from?

asked Jun 17, 2011 at 18:29

33 votes

4 answers

4k views

Why isn't the inverse of the function $x\mapsto x+\sin(x)$ expressible in terms of "the functions one finds on a calculator"?

asked Dec 13, 2012 at 12:48

25 votes

2 answers

4k views

Is there a convention regarding the empty metric space?

asked Jun 13, 2011 at 17:46

22 votes

1 answer

764 views

Computing (on a computer) the first few (non-trivial) zeros of the zeta function of a number field

asked Apr 29, 2011 at 22:56

20 votes

4 answers

2k views

Non-isomorphic exact sequences with isomorphic terms

asked Dec 8, 2011 at 21:38

14 votes

1 answer

3k views

Are all subrings of the rationals Euclidean domains?

asked Jan 6, 2012 at 14:44

10 votes

1 answer

690 views

What is the proof of the "thin set theorem"? A result in infinite Ramsey theory.

asked Feb 10, 2012 at 20:56

10 votes

2 answers

2k views

No torsion in $H^1_c(X,\mathbf{Z})$?

asked Apr 4, 2011 at 9:56

9 votes

2 answers

2k views

Can a finite number of squares, with total area at most 1, be fitted into a square with area 2?

asked Feb 14, 2012 at 14:22

8 votes

3 answers

1k views

Is this an undergraduate-level proof of conservation of energy, or an arbitrary manipulation of symbols that happens to give the right answer?

asked Mar 21, 2013 at 21:25

8 votes

1 answer

336 views

"indecomposability" in theory of groups and topological spaces

asked Nov 10, 2011 at 0:29

7 votes

2 answers

513 views

Asimov quote about "eight million trillion" arrangements of amino acids

asked Aug 13, 2010 at 22:40

2 votes

0 answers

1k views

Proving that $\frac{sinx}{x}=(1-\frac{x^2}{\pi^2})(1-\frac{x^2}{4\pi^2})(...)$ [duplicate]

asked May 20, 2014 at 14:09

2 votes

1 answer

196 views

diameter of graph with taxicab metric

asked Jan 12, 2020 at 18:26

2 votes

2 answers

461 views

What's a "formula"? Is there a "formula" for the n'th prime number?

asked Oct 21, 2020 at 12:15

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17 Questions

Proving you can't make $2011$ out of $1,2,3,4$: nice twist on the usual

Any positive integer solutions to $x^6+y^{10}=z^{15}$?

Where does the term "integral domain" come from?

Why isn't the inverse of the function $x\mapsto x+\sin(x)$ expressible in terms of "the functions one finds on a calculator"?

Is there a convention regarding the empty metric space?

Computing (on a computer) the first few (non-trivial) zeros of the zeta function of a number field

Non-isomorphic exact sequences with isomorphic terms

Are all subrings of the rationals Euclidean domains?

What is the proof of the "thin set theorem"? A result in infinite Ramsey theory.

No torsion in $H^1_c(X,\mathbf{Z})$?

Can a finite number of squares, with total area at most 1, be fitted into a square with area 2?

Is this an undergraduate-level proof of conservation of energy, or an arbitrary manipulation of symbols that happens to give the right answer?

"indecomposability" in theory of groups and topological spaces

Asimov quote about "eight million trillion" arrangements of amino acids

Proving that $\frac{sinx}{x}=(1-\frac{x^2}{\pi^2})(1-\frac{x^2}{4\pi^2})(...)$ [duplicate]

diameter of graph with taxicab metric

What's a "formula"? Is there a "formula" for the n'th prime number?