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cctac: congruence-closure for coq

author: Pierre Corbineau, 
	Stage de DEA au LSV, ENS Cachan
	Thèse au LRI, Université Paris Sud XI 

Files :

- ccalgo.ml : congruence closure algorithm
- ccproof.ml : proof generation code
- cctac.ml4 : the tactic itself
- CCSolve.v : a small Ltac tactic based on congruence 

Known Bugs : the congruence tactic can fail due to type dependencies.

Related documents:
	Peter J. Downey, Ravi Sethi, and Robert E. Tarjan.
	Variations on the common subexpression problem.
	JACM, 27(4):758-771, October 1980.