Theorem pm2.18i

Description: Inference associated with the Clavius law pm2.18 . (Contributed by BJ, 30-Mar-2020)

	Ref	Expression
Hypothesis	pm2.18i.1	$$⊢\neg \phi \to \phi$$
Assertion	pm2.18i	$$⊢\phi$$

Proof

Step	Hyp	Ref	Expression
1		pm2.18i.1	$$⊢\neg \phi \to \phi$$
2		pm2.18	$$⊢\left(\neg \phi \to \phi \right)\to \phi$$
3	1 2	ax-mp	$$⊢\phi$$