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This is a branch that includes: computational complexity theory; complexity classes, NP-completeness and other completeness concepts; oracle analogues of complexity classes; complexity-theoretic computational models; regular languages; context-free languages; Komolgorov Complexity and so on.

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NP-hardness of non-decision problems [closed]

how to show that non-decision problem is NP-hard? So far I could find out that problems which are NP-hard do not have to be decision problems. But how to show a non-decision problem is NP-hard? Is it …
borekking's user avatar
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Pancake sorting problem – Is computing f(n) NP-hard?

The so-called Pancake flipping problem first discussed by Jacob E. Goodman here yields two entangled problems: MIN-SBPR (Sorting By Prefix Reversals) - Given a permutation, find the smallest sequence …
borekking's user avatar