Bürgisser, Peter - On the Structure of Valiant's Complexity Classes

dmtcs:260 - Discrete Mathematics & Theoretical Computer Science, January 1, 1999, Vol. 3 no. 3
On the Structure of Valiant's Complexity Classes

Authors: Bürgisser, Peter

In Valiant developed an algebraic analogue of the theory of NP-completeness for computations of polynomials over a field. We further develop this theory in the spirit of structural complexity and obtain analogues of well-known results by Baker, Gill, and Solovay, Ladner, and Schöning.\par We show that if Valiant's hypothesis is true, then there is a p-definable family, which is neither p-computable nor \textitVNP-complete. More generally, we define the posets of p-degrees and c-degrees of p-definable families and prove that any countable poset can be embedded in either of them, provided Valiant's hypothesis is true. Moreover, we establish the existence of minimal pairs for \textitVP in \textitVNP.\par Over finite fields, we give a \emphspecific example of a family of polynomials which is neither \textitVNP-complete nor p-computable, provided the polynomial hierarchy does not collapse.\par We define relativized complexity classes VP^h and VNP^h and construct complete families in these classes. Moreover, we prove that there is a p-family h satisfying VP^h = VNP^h.

Source : oai:HAL:hal-00958928v1
Volume: Vol. 3 no. 3
Published on: January 1, 1999
Submitted on: March 26, 2015
Keywords: Poset of degrees,Structural complexity,Algebraic theories of NP-completeness diagonalization,Poset of degrees.,[INFO.INFO-DM] Computer Science [cs]/Discrete Mathematics [cs.DM]


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