On Positive P
نویسندگان
چکیده
Continuing a line of research opened up by Grigni and Sipser in 4] and further pursued in 10], we show that a wide variety of equivalent characterizations of P still remain equivalent when restricted to be positive. All these restrictions thus deene the same class posP, a proper subclass of monP, the class of monotone problems in P. We also exhibit complete problems for posP under very weak reductions.
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