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DISJ1_TAC

Tactic.DISJ1_TAC : tactic

Selects the left disjunct of a disjunctive goal.

   A ?- t1 \/ t2
  ===============  DISJ1_TAC
     A ?- t1

Failure

Fails if the goal is not a disjunction.

See also

Thm.DISJ1, Thm.DISJ2, Tactic.DISJ2_TAC