Fantasize about sex instead of obsessing and compulsing.
Who knows? Maybe someday he'll finish writing his book and make lots of money selling it.
Sometimes the distinction between an artillery gun and a howitzer becomes blurred due to the development of gun-howitzers that can perform both roles. The best-known Allied gun-howitzer used during World War II was the British 25-Pounder Gun, which had a caliber of 87 mm.
One can ask if for any algebra the considered problem is always in P or NP-complete (P or coNP-complete)? For example, the problem of the satisfiability of a system of polynomial equations over a group G is in P if G is abelian and NP-complete otherwise ([7, 13]). One of the most widely known subclasses of NP which exhibits such a dichotomy, is the class of constraint satisfaction problems (CSP) on the set {0,1}, see [16]. Recently Bulatov proved the dichotomy for CSP on a three-element set [3].
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