User Ady

172 votes

Examples of common false beliefs in mathematics

answered May 4, 2010 at 21:57

41 votes

Is a topology determined by its convergent sequences?

answered Aug 22, 2010 at 20:08

21 votes

solving $f(f(x))=g(x)$

answered Mar 9, 2010 at 16:42

18 votes

Nice proof of the Jordan curve theorem?

answered Dec 11, 2009 at 16:26

18 votes

Does homeomorphic and isomorphic always imply homeomorphically isomorphic?

answered Oct 30, 2010 at 5:46

12 votes

Accepted

Sequential topological vector spaces

answered Aug 21, 2010 at 17:17

11 votes

Accepted

Is a subspace with a certain property dense in the dual of a vector space?

answered May 5, 2010 at 4:57

11 votes

When can boundedness be characterized topologically in Metric spaces?

answered Jun 19, 2010 at 20:23

11 votes

When is a Banach space a Hilbert space?

answered Mar 31, 2010 at 3:07

9 votes

Accepted

Are there functions satisfying the following integral condition?

answered Jan 30, 2011 at 11:20

8 votes

Rellich-Necas identity

answered Mar 11, 2010 at 8:37

6 votes

Famous mathematical quotes

answered Mar 21, 2010 at 18:09

6 votes

Isomorphisms of Banach Spaces

answered Jan 23, 2010 at 0:44

6 votes

Which math paper maximizes the ratio (importance)/(length)?

answered Dec 1, 2009 at 2:35

6 votes

Topological embeddings of non-compact, complete metric spaces

answered Apr 24, 2010 at 1:33

6 votes

Does Cauchy continuity imply uniform continuity? [No.]

answered Jun 12, 2010 at 5:41

5 votes

Accepted

Orthonormal basis for non-separable inner-product space

answered Aug 26, 2010 at 13:06

4 votes

Is a "contraction space" always complete?

answered Apr 23, 2010 at 20:50

4 votes

Injective maps $\mathbb{R}^{n} \to \mathbb{R}^{m}$

answered Aug 2, 2010 at 12:19

4 votes

Radii and centers in Banach spaces

answered Apr 8, 2010 at 18:52

3 votes

How can I measure the Morse index in infinite dimensions?

answered Apr 15, 2010 at 20:59

3 votes

Accepted

separability of a certain space of continuous functions

answered Feb 2, 2011 at 4:43

3 votes

What are the most overloaded words in mathematics?

answered Dec 1, 2009 at 22:23

3 votes

Show a linear operator is not compact

answered Mar 14, 2010 at 20:31

3 votes

Cone in a metric space

answered Jan 27, 2010 at 22:26

3 votes

Continuous automorphism groups of normed vector spaces?

answered Feb 5, 2010 at 2:32

2 votes

Borsuk pairs of Banach spaces

answered Feb 7, 2010 at 5:48

2 votes

What are some famous rejections of correct mathematics?

answered Feb 4, 2010 at 3:22

2 votes

Examples of inequality implied by equality.

answered Mar 9, 2010 at 10:40

2 votes

Splitting a space into positive and negative parts

answered Dec 3, 2009 at 22:02

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36 Answers

Examples of common false beliefs in mathematics

Is a topology determined by its convergent sequences?

solving $f(f(x))=g(x)$

Nice proof of the Jordan curve theorem?

Does homeomorphic and isomorphic always imply homeomorphically isomorphic?

Sequential topological vector spaces

Is a subspace with a certain property dense in the dual of a vector space?

When can boundedness be characterized topologically in Metric spaces?

When is a Banach space a Hilbert space?

Are there functions satisfying the following integral condition?

Rellich-Necas identity

Famous mathematical quotes

Isomorphisms of Banach Spaces

Which math paper maximizes the ratio (importance)/(length)?

Topological embeddings of non-compact, complete metric spaces

Does Cauchy continuity imply uniform continuity? [No.]

Orthonormal basis for non-separable inner-product space

Is a "contraction space" always complete?

Injective maps $\mathbb{R}^{n} \to \mathbb{R}^{m}$

Radii and centers in Banach spaces

How can I measure the Morse index in infinite dimensions?

separability of a certain space of continuous functions

What are the most overloaded words in mathematics?

Show a linear operator is not compact

Cone in a metric space

Continuous automorphism groups of normed vector spaces?

Borsuk pairs of Banach spaces

What are some famous rejections of correct mathematics?

Examples of inequality implied by equality.

Splitting a space into positive and negative parts