Theorem bj-nimni

Description: Inference associated with bj-nimn . (Contributed by BJ, 19-Mar-2020)

	Ref	Expression
Hypothesis	bj-nimni.1	⊢ 𝜑
Assertion	bj-nimni	⊢ ¬ ( 𝜑 → ¬ 𝜑 )

Proof

Step	Hyp	Ref	Expression
1		bj-nimni.1	⊢ 𝜑
2		bj-nimn	⊢ ( 𝜑 → ¬ ( 𝜑 → ¬ 𝜑 ) )
3	1 2	ax-mp	⊢ ¬ ( 𝜑 → ¬ 𝜑 )