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Top Questions
15
votes
Is There a Complete Problem for the Class of Turing Decidable Problems?
computability
reductions
turing-completeness
recursion-theory
asked Sep 20, 2014 at 19:48
cs.stackexchange.com
13
votes
Is the collapse of $PH$ known to extend downward to classes in-between its levels?
cc.complexity-theory
polynomial-hierarchy
asked Oct 8, 2013 at 1:51
cstheory.stackexchange.com
Top Answers
13
SAT not reducible to 2SAT
cs.stackexchange.com
11
How to reduce the number of crossing edges in a diagram?
cs.stackexchange.com
11
Complexity classes pertaining to listing all solutions?
cs.stackexchange.com
9
What is "polynomial delay?"
cs.stackexchange.com
9
How did each class of languages receive their name?
cs.stackexchange.com
5
A clarification on $PP$
cs.stackexchange.com
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