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Theorem imim12i 57
Description: Inference joining two implications. (Contributed by NM, 5-Aug-1993.) (Proof shortened by O'Cat, 29-Oct-2011.)
Hypotheses
Ref Expression
imim12i.1 (𝜑𝜓)
imim12i.2 (𝜒𝜃)
Assertion
Ref Expression
imim12i ((𝜓𝜒) → (𝜑𝜃))

Proof of Theorem imim12i
StepHypRef Expression
1 imim12i.1 . 2 (𝜑𝜓)
2 imim12i.2 . . 3 (𝜒𝜃)
32imim2i 12 . 2 ((𝜓𝜒) → (𝜓𝜃))
41, 3syl5 32 1 ((𝜓𝜒) → (𝜑𝜃))
Colors of variables: wff set class
Syntax hints:  wi 4
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7
This theorem is referenced by:  imim1i  58  hbim  1453  19.38  1582  cbvexdh  1817  exmoeudc  1979  bj-bdfindis  10431
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