Automated Reasoning: Third International Joint Conference, by Bruno Buchberger (auth.), Ulrich Furbach, Natarajan Shankar PDF

By Bruno Buchberger (auth.), Ulrich Furbach, Natarajan Shankar (eds.)

ISBN-10: 3540371877

ISBN-13: 9783540371878

This booklet constitutes the refereed complaints of the 3rd overseas Joint convention on computerized Reasoning, IJCAR 2006, held in Seattle, WA, united states in August 2006 as a part of the 4th Federated good judgment convention, FLoC 2006. IJCAR 2006 is a merger of CADE, FroCoS, FTP, TABLEAUX, and TPHOLs.

The forty-one revised complete study papers and eight revised approach descriptions awarded including three invited papers and a precis of a structures pageant have been rigorously reviewed and chosen from a complete of 152 submissions. The papers tackle the full spectrum of study in automatic reasoning together with formalization of arithmetic, evidence idea, evidence seek, description logics, interactive evidence checking, higher-order good judgment, blend equipment, satisfiability methods, and rewriting. The papers are equipped in topical sections on proofs, seek, higher-order good judgment, evidence idea, seek, evidence checking, mix, choice tactics, CASC-J3, rewriting, and outline logic.

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Extra info for Automated Reasoning: Third International Joint Conference, IJCAR 2006, Seattle, WA, USA, August 17-20, 2006. Proceedings

Example text

After 4 years of refereeing by a team of 12 referees, an abridged version was published only recently [5]. The referees declared that they were 99% certain of the correctness of the proof. The programs were merely given a “diagonal look”. edu/∼thales/flyspeck) to formalize the whole proof with a theorem prover. This paper is the first definite contribution to flyspeck. Hales’ proof goes roughly like this: any potential counter example (denser packing) gives rise to a tame plane graph, where tameness is a very specific notion; enumerate all (finitely many) tame graphs (by computer); for each of them check (again by computer) that it cannot constitute a counter example.

A graph is tame if it is plane and satisfies 8 conditions: 1. The size of each face is at least 3 and at most 8: tame 1 g ≡ ∀ f ∈F g. 3 ≤ |vertices f | ∧ |vertices f | ≤ 8 2. Every 3-cycle is a face or the opposite of a face: tame 2 g ≡ ∀ a b c. is-cycle g [a, b, c] ∧ distinct [a, b, c] −→ (∃ f ∈F g. vertices f ∼ = [a, b, c] ∨ vertices f ∼ = [c, b, a]) where is-cycle g vs ≡ hd vs ∈ set (neighbors g (last vs)) ∧ is-path g vs, function neighbors does the obvious and is-path g [] = True is-path g (u · vs) = (case vs of [] ⇒ True | v · ws ⇒ v ∈ set (neighbors g u) ∧ is-path g vs) 3.

3) that same (tameEnum 0 800000 ) Tri, same (tameEnum 1 8000000 ) Quad, same (tameEnum 2 20000000 ) Pent, same (tameEnum 3 4000000 ) Hex, same (tameEnum 4 1000000 ) Hept, and same (tameEnum 5 2000000 ) Oct, where same is an executable check of equivalence (modulo )3 of two lists of fgraphs. Corollary fgraph ‘ TameEnum ⊆ Archive follows by correctness of tameEnum (Theorem 4) . We cannot detail the definition of same (or its correctness theorem) but we should point out that it is a potential bottleneck: for p = 2 we need to check 15000 graphs for inclusion in an archive of 1500 graphs — modulo graph isomorphism!

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Automated Reasoning: Third International Joint Conference, IJCAR 2006, Seattle, WA, USA, August 17-20, 2006. Proceedings by Bruno Buchberger (auth.), Ulrich Furbach, Natarajan Shankar (eds.)


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