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Computational Complexity: Impagliazzo's Five Worlds

blog.computationalcomplexity.org · 210 words · saved by 3 readers

Boaz Barak in a comment last week mentioned one of my favorite survey papers, Russell Impagliazzo's A Personal View of Average-Case Complex...

Boaz Barak in a comment last week mentioned one of my favorite survey papers, Russell Impagliazzo's A Personal View of Average-Case Complexity presented at the 1995 Complexity Conference. In that paper he describes five possible worlds and their implications to computer science. Algorithmica: P = NP or something "morally equivalent" like fast probabilistic algorithms for NP. This was the world I described last week but looking back at Impagliazzo's paper, he does a nicer job. Heuristica: NP problems are hard in the worst case but easy on average. Pessiland: NP problems hard on average but…

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