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Theorem pm2.621 422
Description: Theorem *2.621 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm2.621 ((𝜑𝜓) → ((𝜑𝜓) → 𝜓))

Proof of Theorem pm2.621
StepHypRef Expression
1 id 22 . 2 ((𝜑𝜓) → (𝜑𝜓))
2 idd 24 . 2 ((𝜑𝜓) → (𝜓𝜓))
31, 2jaod 393 1 ((𝜑𝜓) → ((𝜑𝜓) → 𝜓))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wo 381
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 195  df-or 383
This theorem is referenced by:  pm2.62  423  pm2.73  885  pm4.72  915  undif4  3981  elnn1uz2  11592
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