EQUIV-IMPLICS-TAC : TACTICEQUIV-IMPLICS-TAC is a tactic.
As defined for use NAT-DED: is a primitive tactic.
Applies EQUIV-IMPLICS if a support line is an equivalence.
As defined for use ETREE-NAT: is a primitive tactic.
If a support line is a rewrite node for an equivalence to a
conjunction, applies the equiv-implics rule.
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