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Top Questions
36
votes
A generalisation of the equation $n = ab + ac + bc$
nt.number-theory
asked Jul 26 '10 at 15:38
mathoverflow.net
27
votes
Is the empty graph a tree?
co.combinatorics
graph-theory
soft-question
trees
convention
asked Feb 1 '13 at 19:33
mathoverflow.net
19
votes
A generalization of the triangle counting problem for simple weighted graphs
co.combinatorics
graph-theory
algorithms
computational-complexity
enumerative-combinatorics
asked Aug 10 '12 at 14:44
mathoverflow.net
19
votes
Executing piped commands in parallel
shell
parallelism
asked Jun 15 '13 at 8:55
unix.stackexchange.com
18
votes
Showing that a certain matrix is not positive definite
linear-algebra
matrices
eigenvalues
asked Sep 28 '16 at 18:28
mathoverflow.net
16
votes
Minimal graphs with a prescribed number of spanning trees
graph-theory
extremal-graph-theory
co.combinatorics
open-problem
asked Apr 10 '12 at 12:45
mathoverflow.net
16
votes
Complexity of recognizing vertex-transitive graphs
cc.complexity-theory
graph-theory
gr.group-theory
asked Oct 27 '12 at 13:14
cstheory.stackexchange.com
16
votes
Good software for linear/integer programming
soft-question
math-software
linear-programming
integer-programming
asked Dec 6 '12 at 23:15
math.stackexchange.com
16
votes
An interesting metric space related to Turing machines
computability
turing-machines
asked Dec 8 '12 at 13:30
cs.stackexchange.com
16
votes
A dense NP complete language implies P=NP
complexity-theory
time-complexity
np-complete
satisfiability
asked Jan 30 '13 at 20:07
cs.stackexchange.com
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next
Top Answers
25
Determinants in Graph Theory
mathoverflow.net
19
Every simple undirected graph with more than $(n-1)(n-2)/2$ edges is connected
cs.stackexchange.com
19
What is the advantage of Randomized Quicksort?
cs.stackexchange.com
19
Why we do isomorphism, automorphism and homomorphism?
cs.stackexchange.com
15
Algorithm to find all 2-hop neighbors lists in a graph
cs.stackexchange.com
12
Are all $4$-regular graphs Hamiltonian
math.stackexchange.com
11
Chromatic polynomial of a grid graph
math.stackexchange.com
11
Important open problems that have already been reduced to a finite but infeasible amount of computation
mathoverflow.net
10
Reverse Graph Spectra Problem?
cstheory.stackexchange.com
10
Random graph model
cs.stackexchange.com
9
Prime numbers $p$ not of the form $ab + bc + ac$ $(0 < a < b < c )$ (and related questions)
mathoverflow.net
7
isomorphic planar graph with its complement
math.stackexchange.com
7
What's a fast algorithm to decide whether there is an $A_G$ corresponding to a given $\chi_G(\lambda)$?
cs.stackexchange.com
7
Software for testing graph homomorphism
cs.stackexchange.com
6
Is there software for graph product calculation and visualization?
cstheory.stackexchange.com
6
Proof of Ramsey's theorem: the number of cliques or anti cliques in a graph
cs.stackexchange.com
6
Chromatic Number and Average degree
math.stackexchange.com
6
Chromatic number of graph defined on the set of permutations
mathoverflow.net
6
Is there any hope to use a computer to guess combinatorial formulas for a sequence of integer values, given some initial terms?
cs.stackexchange.com
5
Finding graphs with a given number of spanning trees
math.stackexchange.com
5
Complete graph invariant
cs.stackexchange.com
5
Buying extreme cold weather “mickey mouse boots” (Bunny boots) in Seoul
travel.stackexchange.com
5
Even bi-coloring of regular graphs
math.stackexchange.com
5
Removal of non-isomorphic edges results in the same graph
mathoverflow.net
5
Does the Tutte polynomial of iterated cone graphs detect isomorphism?
mathoverflow.net
5
Graph Isomorphism for non-mathematician
math.stackexchange.com
5
Algorithms for graph generation using given properties
cs.stackexchange.com
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