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His work in complexity theory includes the classification of approximation problems—showing them to be NP-hard even for weak factors of approximation—and the theory of probabilistically checkable proofs (PCP) and the PCP theorem, which gives stronger characterizations of the class NP in terms of a membership proof that can be verified reading only a constant number of bits. His earlier work on automata theory investigates determinization and complementation of finite automata over infinite strings, in particular the complexity of such translations for Büchi automata, Streett automata and Rabin automata. In 2001, Safra won the Gödel Prize in theoretical computer science for his papers "Interactive Proofs and the Hardness of Approximating Cliques" and "Probabilistic Checking of Proofs: A New Characterization of NP."
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STOCno. 3 (2011): 413-504
Foundations of Computer Sciencepp.212-221, (2010)
Journal of Computer and System Sciencesno. 5 (2006): 638-647
Computational Complexityno. 4 (2006): 281-307
computational complexityno. 1 (2006): 20-39
46TH ANNUAL IEEE SYMPOSIUM ON FOUNDATIONS OF COMPUTER SCIENCE, PROCEEDINGSpp.206-215, (2005)
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