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Theorem jarr 91
Description: Elimination of a nested antecedent as a kind of reversal of inference ja 153. (Contributed by Wolf Lammen, 9-May-2013.)
Ref Expression

Proof of Theorem jarr
StepHypRef Expression
1 ax-1 6 . 2
21imim1i 54 1
Colors of variables: wff setvar class
Syntax hints:   wi 4
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7
This theorem is referenced by:  loolinALT  95  loowoz  96
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