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Theorem jaao 956
Description: Inference conjoining and disjoining the antecedents of two implications. (Contributed by NM, 30-Sep-1999.)
Hypotheses
Ref Expression
jaao.1 (𝜑 → (𝜓𝜒))
jaao.2 (𝜃 → (𝜏𝜒))
Assertion
Ref Expression
jaao ((𝜑𝜃) → ((𝜓𝜏) → 𝜒))

Proof of Theorem jaao
StepHypRef Expression
1 jaao.1 . . 3 (𝜑 → (𝜓𝜒))
21adantr 480 . 2 ((𝜑𝜃) → (𝜓𝜒))
3 jaao.2 . . 3 (𝜃 → (𝜏𝜒))
43adantl 481 . 2 ((𝜑𝜃) → (𝜏𝜒))
52, 4jaod 859 1 ((𝜑𝜃) → ((𝜓𝜏) → 𝜒))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395  wo 847
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  df-an 396  df-or 848
This theorem is referenced by:  pm3.44  961  pm3.48  965  prlem1  1054  elpr2g  4656  ordtri1  6419  ordun  6490  suc11  6493  funun  6614  poxp  8152  suc11reg  9657  rankunb  9888  gruun  10844  ofpreima2  32683  wl-orel12  37492  clsk1indlem3  44033
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