3 search results - page 1 / 1 » Hierarchies in Fragments of Monadic Strict NP |
CIE
2007
Springer
13 years 11 months ago
2007
Springer
We expose a strict hierarchy within monotone monadic strict NP without inequalities (MMSNP), based on the number of second-order monadic quantifiers. We do this by studying a fin...
STACS
2001
Springer
13 years 9 months ago
2001
Springer
In 1974 R. Fagin proved that properties of structures which are in NP are exactly the same as those expressible by existential second order sentences, that is sentences of the form...
ECCC
2006
13 years 5 months ago
2006
Attempts at classifying computational problems as polynomial time solvable, NP-complete, or belonging to a higher level in the polynomial hierarchy, face the difficulty of undecid...