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VPSPACE and a Transfer Theorem over the Reals

Abstract : We introduce a new class VPSPACE of families of polynomials. Roughly speaking, a family of polynomials is in VPSPACE if its coefficients can be computed in polynomial space. Our main theorem is that if (uniform, constant-free) VPSPACE families can be evaluated efficiently then the class PAR of decision problems that can be solved in parallel polynomial time over the real numbers collapses to P. As a result, one must first be able to show that there are VPSPACE families which are hard to evaluate in order to separate over the reals P from NP, or even from PAR.
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Preprints, Working Papers, ...
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Contributor : Sylvain Perifel Connect in order to contact the contributor
Submitted on : Wednesday, January 31, 2007 - 3:14:37 PM
Last modification on : Saturday, September 11, 2021 - 3:17:00 AM
Long-term archiving on: : Tuesday, September 21, 2010 - 12:30:46 PM


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Pascal Koiran, Sylvain Perifel. VPSPACE and a Transfer Theorem over the Reals. 2007. ⟨ensl-00103018v2⟩



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