User Robin Chapman

93 votes

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Are the rationals homeomorphic to any power of the rationals?

answered May 26, 2010 at 12:37

83 votes

Is there a dense subset of the real plane with all pairwise distances rational?

answered Mar 23, 2010 at 19:30

44 votes

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Largest number of vectors with pairwise negative dot product

answered Jul 11, 2010 at 18:08

44 votes

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Function with range equal to whole reals on every open set

answered Jul 16, 2010 at 7:13

38 votes

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Finite nonabelian groups of odd order

answered Jul 12, 2010 at 14:29

35 votes

Can Cantor set be the zero set of a continuous function?

answered May 9, 2010 at 18:22

34 votes

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Shortest/Most elegant proof for $L(1,\chi)\neq 0$

answered May 24, 2010 at 19:53

31 votes

Which number fields are monogenic? and related questions

answered Apr 15, 2010 at 16:31

31 votes

Can the circle be characterized by the following property?

answered Apr 20, 2010 at 14:31

31 votes

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Is every field the field of fractions of an integral domain?

answered Nov 23, 2010 at 15:23

29 votes

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When is sin(r \pi) expressible in radicals for r rational?

answered Aug 21, 2010 at 13:17

27 votes

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Cardinality of the permutations of an infinite set

answered Jun 11, 2010 at 5:52

25 votes

Commutative subalgebras of M_n

answered Jun 22, 2010 at 14:00

23 votes

Why is an elliptic curve a group?

answered Apr 7, 2010 at 12:13

21 votes

Does Smith normal form imply PID?

answered Jul 10, 2010 at 6:47

20 votes

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Galois group of a product of irreducible polynomials

answered Mar 26, 2010 at 15:44

20 votes

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Is completeness of a field an algebraic property?

answered Aug 16, 2010 at 11:26

20 votes

$A_5$-extension of number fields unramified everywhere

answered Nov 4, 2010 at 11:23

19 votes

Good books on theory of distributions

answered Apr 4, 2010 at 17:03

19 votes

How to show that x-y is Lebesgue-Lebesgue measurable

answered Mar 26, 2010 at 13:31

18 votes

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Conjugating a subgroup of a group into a proper subgroup of itself

answered Apr 5, 2010 at 17:45

18 votes

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Long line fundamental groupoid

answered Sep 5, 2010 at 16:33

17 votes

Which elements in SL2(Q) are conjugated to an element in SL2(Z)

answered Oct 26, 2010 at 10:01

17 votes

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What is an antiequivalence of two categories?

answered Apr 18, 2010 at 14:11

17 votes

How does one use the Poisson summation formula?

answered Jun 20, 2010 at 10:59

17 votes

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Maximal Ideals in the ring k[x1,...,xn ]

answered May 30, 2010 at 20:41

16 votes

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Semisimple-ish rings!

answered Jun 28, 2010 at 6:08

16 votes

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Order types of positive reals

answered May 18, 2010 at 7:36

15 votes

Beginning a sentence with a mathematical symbol

answered May 16, 2010 at 7:52

15 votes

Is it true that all the "irrational power" functions are almost polynomial ?

answered Mar 13, 2010 at 11:19

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221 Answers

Are the rationals homeomorphic to any power of the rationals?

Is there a dense subset of the real plane with all pairwise distances rational?

Largest number of vectors with pairwise negative dot product

Function with range equal to whole reals on every open set

Finite nonabelian groups of odd order

Can Cantor set be the zero set of a continuous function?

Shortest/Most elegant proof for $L(1,\chi)\neq 0$

Which number fields are monogenic? and related questions

Can the circle be characterized by the following property?

Is every field the field of fractions of an integral domain?

When is sin(r \pi) expressible in radicals for r rational?

Cardinality of the permutations of an infinite set

Commutative subalgebras of M_n

Why is an elliptic curve a group?

Does Smith normal form imply PID?

Galois group of a product of irreducible polynomials

Is completeness of a field an algebraic property?

$A_5$-extension of number fields unramified everywhere

Good books on theory of distributions

How to show that x-y is Lebesgue-Lebesgue measurable

Conjugating a subgroup of a group into a proper subgroup of itself

Long line fundamental groupoid

Which elements in SL2(Q) are conjugated to an element in SL2(Z)

What is an antiequivalence of two categories?

How does one use the Poisson summation formula?

Maximal Ideals in the ring k[x1,...,xn ]

Semisimple-ish rings!

Order types of positive reals

Beginning a sentence with a mathematical symbol

Is it true that all the "irrational power" functions are almost polynomial ?