Theorem pm2.24 72

Description: Theorem *2.24 of [WhiteheadRussell] p. 104.

Assertion

Ref	Expression
pm2.24	⊢ (φ → (¬ φ → ψ))

Proof of Theorem pm2.24

Step	Hyp	Ref	Expression
1		pm2.21 71	. 2 ⊢ (¬ φ → (φ → ψ))
2	1	com12 13	1 ⊢ (φ → (¬ φ → ψ))

Syntax hints:  ¬ wn 1   → wi 2

This theorem is referenced by:  oridm 208  orc 225  pm5.18 497  dedlema 569  prlem1 576  axpowndlem1 3743  ltlent 4288

This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6

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