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Theorem idi 2
Description: Inference form of id 20. This inference rule, which requires no axioms for its proof, is useful as a copy-paste mechanism during proof development in mmj2. It is normally not referenced in the final version of a proof, since it is always redundant and can be removed using the 'minimize *' command in the metamath program's Proof Assistant. (Contributed by Alan Sare, 31-Dec-2011.)
Ref Expression
idi.1  |-  ph
Ref Expression
idi  |-  ph

Proof of Theorem idi
StepHypRef Expression
1 idi.1 1  |-  ph
Colors of variables: wff set class
This theorem is referenced by:  onfrALTlem2  27977  a9e2nd  27990  e233  28220  trsspwALT2  28275  sspwtrALT  28278  sstrALT2  28290  suctrALT3  28379  sspwimpALT  28380  a9e2ndALT  28386  a9e2ndeqALT  28387
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