Christian Glaßer, Alan L. Selman, Liyu Zhang

We prove that every disjoint NP-pair is polynomial-time, many-one equivalent to

the canonical disjoint NP-pair of some propositional proof system. Therefore, the degree structure of the class of disjoint NP-pairs and of all canonical pairs is

identical. Secondly, we show that this degree structure is not superficial: Assuming there exist ...
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