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Theorem 3anbi2i 1158
Description: Inference adding two conjuncts to each side of a biconditional. (Contributed by NM, 8-Sep-2006.)
Hypothesis
Ref Expression
3anbi1i.1 (𝜑𝜓)
Assertion
Ref Expression
3anbi2i ((𝜒𝜑𝜃) ↔ (𝜒𝜓𝜃))

Proof of Theorem 3anbi2i
StepHypRef Expression
1 biid 170 . 2 (𝜒𝜒)
2 3anbi1i.1 . 2 (𝜑𝜓)
3 biid 170 . 2 (𝜃𝜃)
41, 2, 33anbi123i 1155 1 ((𝜒𝜑𝜃) ↔ (𝜒𝜓𝜃))
Colors of variables: wff set class
Syntax hints:  wb 104  w3a 947
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107
This theorem depends on definitions:  df-bi 116  df-3an 949
This theorem is referenced by:  seq3f1olemp  10243  seq3f1oleml  10244  fsum3  11124
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