System Description: E.T. 0.1
Cezary Kaliszyk
Stephan Schulz
Josef Urban
Jiri Vyskocil
E.T. 0.1 is a meta-system specialized for theorem proving over large
first-order theories containing thousands of axioms. Its design is
motivated by the recent theorem proving experiments over the Mizar,
Flyspeck and Isabelle data-sets. Unlike other approaches, E.T. does
not learn from related proofs, but assumes a situation where previous
proofs are not available or hard to get. Instead, E.T. uses several
layers of complementary methods and tools with different speed and
precision that ultimately select small sets of the most promising
axioms for a given conjecture. Such filtered problems are then passed
to E, running a large number of suitable automatically invented
theorem-proving strategies. On the large-theory Mizar problems,
E.T. considerably outperforms E, Vampire, and any other prover that
does not learn from related proofs. As a general ATP, E.T. improved
over the performance of unmodified E in the combined FOF division of
CASC 2014 by 6\%.