Theorem pm2.24i

Description: Inference associated with pm2.24 . Its associated inference is pm2.24ii . (Contributed by NM, 20-Aug-2001)

	Ref	Expression
Hypothesis	pm2.24i.1	⊢ 𝜑
Assertion	pm2.24i	⊢ ( ¬ 𝜑 → 𝜓 )

Proof

Step	Hyp	Ref	Expression
1		pm2.24i.1	⊢ 𝜑
2	1	a1i	⊢ ( ¬ 𝜓 → 𝜑 )
3	2	con1i	⊢ ( ¬ 𝜑 → 𝜓 )