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Theorem simprim 150
Description: Simplification. Similar to Theorem *3.27 (Simp) of [WhiteheadRussell] p. 112. (Contributed by NM, 3-Jan-1993.) (Proof shortened by Wolf Lammen, 13-Nov-2012.)
Assertion
Ref Expression
simprim

Proof of Theorem simprim
StepHypRef Expression
1 idd 24 . 2
21impi 148 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4
This theorem is referenced by:  impt  157  bi3  187  bi2  198  imbi12  322
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
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