Theorem bj-nimni

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

	Ref	Expression
Hypothesis	bj-nimni.1	$$⊢\phi$$
Assertion	bj-nimni	$$⊢\neg \left(\phi \to \neg \phi \right)$$

Proof

Step	Hyp	Ref	Expression
1		bj-nimni.1	$$⊢\phi$$
2		bj-nimn	$$⊢\phi \to \neg \left(\phi \to \neg \phi \right)$$
3	1 2	ax-mp	$$⊢\neg \left(\phi \to \neg \phi \right)$$