User mdp

216 votes

What is the difference between linear and affine function

answered Jan 10, 2013 at 18:29

80 votes

Examples of patterns that eventually fail

answered Feb 20, 2012 at 21:48

69 votes

What is the difference between a Ring and an Algebra?

answered May 3, 2013 at 11:18

39 votes

Accepted

undergraduate math vs graduate math

answered May 22, 2012 at 12:35

38 votes

Can't argue with success? Looking for "bad math" that "gets away with it"

answered Dec 17, 2012 at 14:51

31 votes

Subring of a finitely generated Noetherian ring need not be Noetherian?

answered Sep 18, 2013 at 14:46

30 votes

Accepted

If every eigenvalue of $A$ is zero, does this mean $A$ is a zero matrix?

answered Mar 28, 2012 at 21:20

26 votes

Accepted

Does law of excluded middle prove itself?

answered Feb 6, 2013 at 13:21

23 votes

Is it morally right and pedagogically right to google answers to homework?

answered Sep 3, 2012 at 13:32

22 votes

Accepted

Is every subset of a metric space a metric subspace?

answered Oct 25, 2012 at 14:22

22 votes

Accepted

A subgroup of a cyclic group is cyclic - Understanding Proof

answered Feb 5, 2013 at 16:47

21 votes

Are "if" and "iff" interchangeable in definitions?

answered Nov 14, 2013 at 9:54

19 votes

Accepted

Etymology of Tor and Ext Functors

answered Jul 1, 2013 at 16:58

17 votes

About the Continuum Hypothesis

answered Mar 26, 2012 at 14:30

16 votes

$-1$ is a quadratic residue modulo $p$ if and only if $p\equiv 1\pmod{4}$

answered Mar 19, 2012 at 13:18

16 votes

Accepted

When are quotient maps induced by equivalence relations surjective and injective?

answered Sep 27, 2012 at 21:42

15 votes

What are some examples of infinite dimensional vector spaces?

answered Aug 13, 2013 at 16:17

14 votes

What if not connectedness defines a graph?

answered Nov 4, 2014 at 12:32

13 votes

Accepted

Endomorphisms of a finite dimensional vector space

answered Aug 6, 2013 at 14:51

13 votes

What is the notation for the set of all $m\times n$ matrices?

answered Jun 5, 2013 at 17:40

13 votes

Do we really need polynomials (In contrast to polynomial functions)?

answered May 13, 2013 at 10:20

13 votes

Accepted

Does $ \left\lceil \frac{1}{n}\right\rceil\to 0$ or $1$ as $n\to\infty ?$

answered Mar 4, 2013 at 15:20

12 votes

Accepted

Multiplicative Selfinverse in Fields

answered Jun 13, 2012 at 15:43

11 votes

Variety vs. Manifold

answered May 21, 2012 at 18:01

11 votes

Accepted

Topological invariants

answered May 8, 2012 at 12:18

10 votes

Accepted

Question about basis and finite dimensional vector space

answered May 3, 2012 at 12:18

10 votes

Accepted

Does there exist a vector space with 30 elements?

answered May 8, 2012 at 10:21

10 votes

Show that in a discrete metric space, every subset is both open and closed.

answered Sep 11, 2012 at 15:52

10 votes

The definition of continuous function in topology

answered Mar 7, 2013 at 14:06

9 votes

Accepted

Small Question on the Tor functor

answered Oct 25, 2012 at 13:09

Stack Exchange Network

235 Answers

What is the difference between linear and affine function

Examples of patterns that eventually fail

What is the difference between a Ring and an Algebra?

undergraduate math vs graduate math

Can't argue with success? Looking for "bad math" that "gets away with it"

Subring of a finitely generated Noetherian ring need not be Noetherian?

If every eigenvalue of $A$ is zero, does this mean $A$ is a zero matrix?

Does law of excluded middle prove itself?

Is it morally right and pedagogically right to google answers to homework?

Is every subset of a metric space a metric subspace?

A subgroup of a cyclic group is cyclic - Understanding Proof

Are "if" and "iff" interchangeable in definitions?

Etymology of Tor and Ext Functors

About the Continuum Hypothesis

$-1$ is a quadratic residue modulo $p$ if and only if $p\equiv 1\pmod{4}$

When are quotient maps induced by equivalence relations surjective and injective?

What are some examples of infinite dimensional vector spaces?

What if not connectedness defines a graph?

Endomorphisms of a finite dimensional vector space

What is the notation for the set of all $m\times n$ matrices?

Do we really need polynomials (In contrast to polynomial functions)?

Does $ \left\lceil \frac{1}{n}\right\rceil\to 0$ or $1$ as $n\to\infty ?$

Multiplicative Selfinverse in Fields

Variety vs. Manifold

Topological invariants

Question about basis and finite dimensional vector space

Does there exist a vector space with 30 elements?

Show that in a discrete metric space, every subset is both open and closed.

The definition of continuous function in topology

Small Question on the Tor functor