Theorem orim2 ≪ | index | src | ≫

theorem orim2 (a b c: wff): $ (b -> c) -> a \/ b -> a \/ c $;

Step	Hyp	Ref	Expression
1		id	(b -> c) -> b -> c
2	1	orim2d	(b -> c) -> a \/ b -> a \/ c

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)