Theorem pm5.11

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

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

Proof

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