Theorem imim2 | index | src |

theorem imim2 (a b c: wff): $ (b -> c) -> (a -> b) -> a -> c $;
StepHypRefExpression
1 ax_1
(b -> c) -> a -> b -> c
2 1 a2d
(b -> c) -> (a -> b) -> a -> c

Axiom use

axs_prop_calc (ax_1, ax_2, ax_mp)