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14.252 Ponens-seqop used on non-inference

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Origin: check. Landing-place: diagnose.

Ponens-seqop used on non-inference R

The Ponens sequent operator applied to a sequent << P ,, C ,, h infer x >> yields << P setunion {{ h }} ,, C ,, x >>. Thus, the Ponens operator allows to move a hypothesis h from the conclusion to the set of premisses. Meta-modus-ponens can be implemented as a Cut sequent operator whose second argument has a Ponens sequent operator as principal operator.

The 'Ponens-seqop used on non-inference' indicates that the conclusion of the sequent did not have form h infer x. The error may indicate an error in the proof or a bug in a tactic.

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