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Theorem 3bitr2ri 207
Description: A chained inference from transitive law for logical equivalence. (Contributed by NM, 4-Aug-2006.)
Hypotheses
Ref Expression
3bitr2i.1 (𝜑𝜓)
3bitr2i.2 (𝜒𝜓)
3bitr2i.3 (𝜒𝜃)
Assertion
Ref Expression
3bitr2ri (𝜃𝜑)

Proof of Theorem 3bitr2ri
StepHypRef Expression
1 3bitr2i.1 . . 3 (𝜑𝜓)
2 3bitr2i.2 . . 3 (𝜒𝜓)
31, 2bitr4i 185 . 2 (𝜑𝜒)
4 3bitr2i.3 . 2 (𝜒𝜃)
53, 4bitr2i 183 1 (𝜃𝜑)
Colors of variables: wff set class
Syntax hints:  wb 103
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106
This theorem depends on definitions:  df-bi 115
This theorem is referenced by:  sbnf2  1905  ssrab  3099  rabn0m  3310  unidif0  4002  relop  4586  dmopab3  4649  issref  4814  fununi  5082  cnvoprab  5999  ssfirab  6641
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