The mu tac command applies a proof rule to
definite description () expressions.
The definite description expressions must be
in antecedent or consequent predicates.
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The proof rule is not applicable if there are any names in the schema s that refer to declarations that are in p but not in s.
"mu tac" e2 e3
This example applies the mu tac command to definite description expressions e2 and e3.