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Top Questions
96 votes

A map is continuous if and only if for every set, the image of closure is contained in the closure of image

general-topology continuity asked Feb 28, 2012 at 16:18
math.stackexchange.com

32 votes

Continuous Functions from $\mathbb{R}$ to $\mathbb{Q}$

general-topology asked Feb 22, 2012 at 14:40
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25 votes

Category Theory usage in Algebraic Topology

algebraic-topology soft-question category-theory asked Jul 17, 2012 at 12:00
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22 votes

History of Modern Mathematics Available on the Internet

reference-request math-history online-resources asked Jun 4, 2012 at 21:37
math.stackexchange.com

20 votes

Solving the recursion $3a_{n+1}=2(n+1)a_n+5(n+1)!$ via generating functions

homework recurrence-relations power-series generating-functions asked Apr 23, 2012 at 13:46
math.stackexchange.com

18 votes

Infinite Degree Algebraic Field Extensions

abstract-algebra field-theory asked May 30, 2012 at 13:36
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17 votes

Free Graph Theory Resources

reference-request graph-theory online-resources asked May 12, 2012 at 9:30
math.stackexchange.com

15 votes

Question Regarding Cardano's Formula

algebra-precalculus roots cubics asked Jun 13, 2012 at 11:22
math.stackexchange.com

14 votes

Groups of units of $\mathbb{Z}\left[\frac{1+\sqrt{-3}}{2}\right]$

abstract-algebra ring-theory algebraic-number-theory asked Feb 2, 2012 at 21:09
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13 votes

Coproducts in $\text{Ab}$

abstract-algebra group-theory category-theory abelian-groups asked Nov 24, 2012 at 16:17
math.stackexchange.com

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Top Answers
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What's the precise meaning of imaginary number?
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Good First Course in real analysis book for self study
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A finite graph with exactly two vertices with odd degree must have a path joining them.
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Free Graph Theory Resources
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the Nordhaus-Gaddum problems for chromatic number of graph and its complement
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undergraduate math vs graduate math
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Prove by induction. How do I prove $\sum\limits_{i=0}^n2^i=2^{n+1}-1$ with induction?
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Given a matrix A, how to find B such that AB=BA
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What are the theorems of mathematics proved by a computer so far?
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The series $\sum_{n=1}^\infty \frac{n}{n+1}$
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Gauss' proof of the irreducibility of a cyclotomic polynomial
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Prove that if $f \circ g = f\circ h$, then $g = h$
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logical question: prove that a number is divisible by 6
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In how many ways can 2 balls be arranged in 5 boxes so that one box does not contain more than one ball?
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Exercise 1.1.18 in Hatcher's Algebraic Topology
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Proofs of Sylow theorems
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