NFE Home New Foundations Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  NFE Home  >  Th. List  >  2th Unicode version

Theorem 2th 230
Description: Two truths are equivalent. (Contributed by NM, 18-Aug-1993.)
Hypotheses
Ref Expression
2th.1
2th.2
Assertion
Ref Expression
2th

Proof of Theorem 2th
StepHypRef Expression
1 2th.2 . . 3
21a1i 10 . 2
3 2th.1 . . 3
43a1i 10 . 2
52, 4impbii 180 1
Colors of variables: wff setvar class
Syntax hints:   wb 176
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
This theorem is referenced by:  2false  339  trujust  1318  bitru  1326  exiftruOLD  1658  pm11.07  2115  vjust  2860  dfnul2  3552  dfnul3  3553  rab0  3571  pwv  3886  int0  3940  0iin  4024
  Copyright terms: Public domain W3C validator