The PCP theorem for NP over the reals
Martijn Baartse, Klaus Meer · DROPS (Schloss Dagstuhl – Leibniz Center for Informatics) · 2013
In this paper we show that the PCP theorem holds as well in the real number computational model introduced by Blum, Shub, and Smale. More precisely, the real number counterpart NP_R of the classical Turing model class NP can be characterized as NP_R = PCP_R(O(log n), O(1)). Our proof structurally follows the one by Dinur for classical NP. However, a lot of minor and major changes are necessary due to the real numbers as underlying computational structure. The analogue result holds for the complex numbers and NP_C.