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14.253 Probans-seqop used on non-endorsement

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Origin: check. Landing-place: diagnose.

Probans-seqop used on non-endorsement R

The modus probans sequent operator applied to a sequent << P ,, C ,, s endorse x >> yields << P ,, C setunion {{ s }} ,, x >>. Thus, the probans operator allows to move a side condition s from the conclusion to the set of assumed side conditions. The 'Probans-seqop used on non-endorsement' indicates that the conclusion of the sequent did not have form s endorse x. The error may indicate an error in the proof or a bug in a tactic.

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