DEDUCT-TAC : TACTIC

DEDUCT-TAC is a tactic.
As defined for use NAT-DED: is a primitive tactic.
Applies DEDUCT if planned line is an implication.
As defined for use ETREE-NAT: is a primitive tactic.
Applies deduction rule if planned line corresponds to an implication node.
Same as Pfenning's tactic 191.

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