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Theorem imor 401
Description: Implication in terms of disjunction. Theorem *4.6 of [WhiteheadRussell] p. 120. (Contributed by NM, 5-Aug-1993.)
Assertion
Ref Expression
imor

Proof of Theorem imor
StepHypRef Expression
1 notnot 282 . . 3
21imbi1i 315 . 2
3 df-or 359 . 2
42, 3bitr4i 243 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wi 4   wb 176   wo 357
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 177  df-or 359
This theorem is referenced by:  imori  402  imorri  403  pm4.62  408  pm4.52  477  pm4.78  565  rb-bijust  1514  rb-imdf  1515  rb-ax1  1517  nf4  1868  r19.30  2756  dfimak2  4298  nncaddccl  4419  nndisjeq  4429  preaddccan2lem1  4454  ltfintrilem1  4465  evenoddnnnul  4514  leconnnc  6218  addccan2nclem2  6264  nchoicelem16  6304
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