NFE Home New Foundations Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  NFE Home  >  Th. List  >  ecase Unicode version

Theorem ecase 908
Description: Inference for elimination by cases. (Contributed by NM, 13-Jul-2005.)
Hypotheses
Ref Expression
ecase.1
ecase.2
ecase.3
Assertion
Ref Expression
ecase

Proof of Theorem ecase
StepHypRef Expression
1 ecase.3 . . 3
21ex 423 . 2
3 ecase.1 . 2
4 ecase.2 . 2
52, 3, 4pm2.61nii 158 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wi 4   wa 358
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 177  df-an 360
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator