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Theorem syl7bi 255
Description: A mixed syllogism inference from a doubly nested implication and a biconditional. (Contributed by NM, 14-May-1993.)
Hypotheses
Ref Expression
syl7bi.1 (𝜑𝜓)
syl7bi.2 (𝜒 → (𝜃 → (𝜓𝜏)))
Assertion
Ref Expression
syl7bi (𝜒 → (𝜃 → (𝜑𝜏)))

Proof of Theorem syl7bi
StepHypRef Expression
1 syl7bi.1 . . 3 (𝜑𝜓)
21biimpi 216 . 2 (𝜑𝜓)
3 syl7bi.2 . 2 (𝜒 → (𝜃 → (𝜓𝜏)))
42, 3syl7 74 1 (𝜒 → (𝜃 → (𝜑𝜏)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206
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 207
This theorem is referenced by:  3jao  1424  rspct  3608  zfpair  5427  gruen  10850  axpre-sup  11207  nn0lt2  12679  fzofzim  13746  ndvdssub  16443  cyccom  19234  alexsubALT  24075  clwlkclwwlklem2a  30027  erclwwlktr  30051  erclwwlkntr  30100  fmlasuc  35371  dfon2lem8  35772  prtlem15  38857  prtlem18  38859  2reuimp0  47064
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