Module Type SUBST_SOUND.
Declare Module VSD: VERISTAR_DEFS.

Axiom clause_denote_PosSpaceClause_sound: forall i e Gamma Sigma Delta,
clause_denote (PosSpaceClause (subst_pures_delete i e Gamma) Sigma Delta) =
clause_denote (PosSpaceClause (subst_pures i e Gamma) Sigma Delta).