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Theorem 3imp3i2anOLD 1402
 Description: Obsolete version of 3imp3i2an 1401 as of 13-Apr-2022. (Contributed by Alan Sare, 17-Oct-2017.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypotheses
Ref Expression
3imp3i2an.1 ((𝜑𝜓𝜒) → 𝜃)
3imp3i2an.2 ((𝜑𝜒) → 𝜏)
3imp3i2an.3 ((𝜃𝜏) → 𝜂)
Assertion
Ref Expression
3imp3i2anOLD ((𝜑𝜓𝜒) → 𝜂)

Proof of Theorem 3imp3i2anOLD
StepHypRef Expression
1 3imp3i2an.2 . . . . . . 7 ((𝜑𝜒) → 𝜏)
2 3imp3i2an.1 . . . . . . . . . 10 ((𝜑𝜓𝜒) → 𝜃)
323exp 1112 . . . . . . . . 9 (𝜑 → (𝜓 → (𝜒𝜃)))
4 3imp3i2an.3 . . . . . . . . . 10 ((𝜃𝜏) → 𝜂)
54ex 449 . . . . . . . . 9 (𝜃 → (𝜏𝜂))
63, 5syl8 76 . . . . . . . 8 (𝜑 → (𝜓 → (𝜒 → (𝜏𝜂))))
76com4r 94 . . . . . . 7 (𝜏 → (𝜑 → (𝜓 → (𝜒𝜂))))
81, 7syl 17 . . . . . 6 ((𝜑𝜒) → (𝜑 → (𝜓 → (𝜒𝜂))))
98ex 449 . . . . 5 (𝜑 → (𝜒 → (𝜑 → (𝜓 → (𝜒𝜂)))))
109pm2.43b 55 . . . 4 (𝜒 → (𝜑 → (𝜓 → (𝜒𝜂))))
1110com4r 94 . . 3 (𝜒 → (𝜒 → (𝜑 → (𝜓𝜂))))
1211pm2.43i 52 . 2 (𝜒 → (𝜑 → (𝜓𝜂)))
13123imp231 1104 1 ((𝜑𝜓𝜒) → 𝜂)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383   ∧ w3a 1072 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 197  df-an 385  df-3an 1074 This theorem is referenced by: (None)
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