Theorem syl5 ≪ | index | src | ≫

theorem syl5 (a b c d: wff): $ b -> c $ > $ a -> c -> d $ > $ a -> b -> d $;

Step	Hyp	Ref	Expression
1		hyp h1	b -> c
2	1	a1i	a -> b -> c
3		hyp h2	a -> c -> d
4	2, 3	syld	a -> b -> d

Axiom use

axs_prop_calc (ax_1, ax_2, ax_mp)