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For question borderline with, or having application to, computer science. Consider also posting http://cs.stackexchange.com/ or http://cstheory.stackexchange.com/ instead of here, if appropriate.

6 votes

Emptiness and determinization of NFAs

What you are asking about is known as the universality problem. In the slides by Jeffrey Shallit (http://www.cs.uwaterloo.ca/~shallit/Talks/open10r.pdf, slide 36) it is mentioned that this problem is …
Grigory Yaroslavtsev's user avatar
5 votes

Prove a function is primitive recursive

There is a theorem that says that any function computable on a Turing machine in time that is a primitive recursive function of the length of the input is primitively recursive. This theorem you can …
Grigory Yaroslavtsev's user avatar