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Austin Buchanan

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cc.complexity-theory

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4 posts edited

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15 Questions

Votes Activity Newest Views

votes

answers

views

Reasons to believe $P \ne NP \cap coNP$ (or not)

cc.complexity-theory np conditional-results

Sep 12 '14 at 15:31 Community♦ 1

votes

answers

472

views

Linear-time algorithm to test if clique number equals degeneracy bound?

graph-algorithms parameterized-complexity clique fixed-parameter-tractable

Feb 12 at 4:14 Austin Buchanan 1,616

votes

answer

views

How can a problem be in NP, be NP-hard and not NP-complete?

cc.complexity-theory np-hardness complexity-classes terminology

Apr 13 '13 at 19:03 Community♦ 1

votes

answers

600

views

Exact exponential-time algorithms for 0-1 programming

np-hardness integer-programming exp-time-algorithms

Aug 29 '13 at 23:47 Community♦ 1

votes

answer

241

views

When does a graph admit an orientation in which there is at most one s-t walk?

graph-theory directed-acyclic-graph

May 7 '15 at 23:34 Community♦ 1

votes

answers

394

views

Exact exponential-time algorithms for 0-1 programs with nonnegative data

np-hardness integer-programming exp-time-algorithms

Dec 16 '13 at 22:06 Community♦ 1

votes

answer

856

views

Max-weight connected subgraph problem in planar graphs

reference-request np-hardness reductions planar-graphs

Mar 22 '14 at 21:03 Community♦ 1

votes

answers

views

Hardest problems to approximate

approximation-hardness clique

Jun 12 '13 at 8:19 Mohammad Al-Turkistany 20.3k

votes

answers

546

views

Weighted vertex-connectivity; global min vertex-cut

graph-algorithms max-flow-min-cut

Jun 6 '13 at 23:46 Community♦ 1

votes

answers

102

views

Testbed of perfect graphs

perfect-graph

Dec 5 '13 at 12:05 Austin Buchanan 1,616

votes

answer

186

views

When are all facets rank facets? (for independence system polyhedra)

independence polytope

Aug 12 '15 at 15:06 Yohann 36

votes

answer

195

views

What is known about this binary representation polytope?

linear-programming integer-programming polytope

May 30 '14 at 14:04 Sasho Nikolov 17.9k

votes

answers

325

views

Approximation factor when objective can be negative

approximation-algorithms

May 21 '13 at 4:34 Austin Buchanan 1,616

votes

answer

187

views

Dual/complement of independence system

co.combinatorics independence set-system

Jun 28 '13 at 4:14 Sasho Nikolov 17.9k

vote

answer

213

views

Node-weighted steiner problem with few terminals

graph-algorithms np-hardness parameterized-complexity fixed-parameter-tractable

Jul 25 '14 at 15:30 Community♦ 1

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15 Questions

Reasons to believe $P \ne NP \cap coNP$ (or not)

Linear-time algorithm to test if clique number equals degeneracy bound?

How can a problem be in NP, be NP-hard and not NP-complete?

Exact exponential-time algorithms for 0-1 programming

When does a graph admit an orientation in which there is at most one s-t walk?

Exact exponential-time algorithms for 0-1 programs with nonnegative data

Max-weight connected subgraph problem in planar graphs

Hardest problems to approximate

Weighted vertex-connectivity; global min vertex-cut

Testbed of perfect graphs

When are all facets rank facets? (for independence system polyhedra)

What is known about this binary representation polytope?

Approximation factor when objective can be negative

Dual/complement of independence system

Node-weighted steiner problem with few terminals