Theorem bj-pm2.01i

Description: Inference associated with the weak Clavius law pm2.01 . (Contributed by BJ, 30-Mar-2020)

	Ref	Expression
Hypothesis	bj-pm2.01i.1	⊢ ( 𝜑 → ¬ 𝜑 )
Assertion	bj-pm2.01i	⊢ ¬ 𝜑

Proof

Step	Hyp	Ref	Expression
1		bj-pm2.01i.1	⊢ ( 𝜑 → ¬ 𝜑 )
2		pm2.01	⊢ ( ( 𝜑 → ¬ 𝜑 ) → ¬ 𝜑 )
3	1 2	ax-mp	⊢ ¬ 𝜑