User Valerio Capraro

52 votes

What are some examples of ingenious, unexpected constructions?

answered Mar 11, 2012 at 1:35

18 votes

Uncountable family of infinite subsets with pairwise finite intersections

answered Feb 23, 2012 at 18:01

11 votes

When is a Banach space a Hilbert space?

answered Oct 7, 2011 at 9:50

8 votes

What is a continuous path?

answered Nov 13, 2011 at 13:33

8 votes

Self-dual normed spaces which are not Hilbert spaces

answered Mar 16, 2012 at 9:22

6 votes

Orthogonality in non-inner product spaces

answered Mar 4, 2012 at 3:08

6 votes

Accepted

What is the domain of the "average operator"?

answered May 12, 2012 at 18:34

5 votes

How did "Ore's Conjecture" become a conjecture?

answered Oct 7, 2011 at 15:25

5 votes

Topological Characterisation of the real line.

answered Sep 22, 2011 at 17:15

5 votes

Accepted

Is there an axiomatic approach of the notion of dimension ?

answered Nov 11, 2011 at 21:49

4 votes

What properties make $[0,1]$ a good candidate for defining fundamental groups?

answered Mar 26, 2012 at 19:36

3 votes

Fair but irregular polyhedral dice

answered Dec 9, 2011 at 21:27

3 votes

Accepted

Axiom of choice and convergence

answered Feb 1, 2012 at 10:56

3 votes

Why are Nash-Equilibria inside the Simplex S_n unique ?

answered Feb 20, 2012 at 20:17

3 votes

Reference for the Gelfand duality theorem for commutative von Neumann algebras

answered Feb 23, 2012 at 7:42

2 votes

Can we have a finite cyclic group of rational numbers (under multiplication)?

answered May 30, 2012 at 9:40

2 votes

Representing a real number as the value of a countably infinite game

answered Jun 3, 2012 at 12:12

2 votes

A variational principle for amenable groups

answered Jan 25, 2012 at 10:00

2 votes

Direct construction of the integers

answered Nov 6, 2011 at 16:18

2 votes

Reformulation of amenability and growth rate of a group in terms of general metric spaces.

answered May 28, 2011 at 16:08

1 vote

Invariant means on commutative magmas

answered Jun 5, 2011 at 23:45

1 vote

Ultrafilters and principal filters

answered Sep 27, 2011 at 12:14

1 vote

Can we efficiently compute a third Nash Equilibrium, given two?

answered Jun 19, 2013 at 4:08

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23 Answers

What are some examples of ingenious, unexpected constructions?

Uncountable family of infinite subsets with pairwise finite intersections

When is a Banach space a Hilbert space?

What is a continuous path?

Self-dual normed spaces which are not Hilbert spaces

Orthogonality in non-inner product spaces

What is the domain of the "average operator"?

How did "Ore's Conjecture" become a conjecture?

Topological Characterisation of the real line.

Is there an axiomatic approach of the notion of dimension ?

What properties make $[0,1]$ a good candidate for defining fundamental groups?

Fair but irregular polyhedral dice

Axiom of choice and convergence

Why are Nash-Equilibria inside the Simplex S_n unique ?

Reference for the Gelfand duality theorem for commutative von Neumann algebras

Can we have a finite cyclic group of rational numbers (under multiplication)?

Representing a real number as the value of a countably infinite game

A variational principle for amenable groups

Direct construction of the integers

Reformulation of amenability and growth rate of a group in terms of general metric spaces.

Invariant means on commutative magmas

Ultrafilters and principal filters

Can we efficiently compute a third Nash Equilibrium, given two?