Theorem intror_neg_imp ≪ | index | src | ≫

右引入\neg\imp

theorem intror_neg_imp (A B: wff): $ A \imp \neg A \imp B $;

Step	Hyp	Ref	Expression
1		imp_imp_swapl	(\neg A \imp A \imp B) \imp A \imp \neg A \imp B
2		neg_elimintror_imp	\neg A \imp A \imp B
3	1, 2	ax_mp	A \imp \neg A \imp B

Axiom use

Logic (ax_mp, ax_1, ax_2, ax_3)