Theorem imim1 | index | src |

theorem imim1 (a b c: wff): $ (a -> b) -> (b -> c) -> a -> c $;
StepHypRefExpression
1 imim2
(b -> c) -> (a -> b) -> a -> c
2 1 com12
(a -> b) -> (b -> c) -> a -> c

Axiom use

axs_prop_calc (ax_1, ax_2, ax_mp)