Theorem pm5.11 941

Description: Theorem *5.11 of [WhiteheadRussell] p. 123. (Contributed by NM, 3-Jan-2005.)

Assertion

Ref	Expression
pm5.11	⊢ ((𝜑 → 𝜓) ∨ (¬ 𝜑 → 𝜓))

Proof of Theorem pm5.11

Step	Hyp	Ref	Expression
1		pm5.11g 940	1 ⊢ ((𝜑 → 𝜓) ∨ (¬ 𝜑 → 𝜓))

Syntax hints:  ¬ wn 3   → wi 4   ∨ wo 843

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 206  df-or 844

This theorem is referenced by: (None)