Theorem mpbid | index | src |

theorem mpbid (a b c: wff): $ a -> (b <-> c) $ > $ a -> b $ > $ a -> c $;
StepHypRefExpression
1 hyp h2
a -> b
2 hyp h1
a -> (b <-> c)
3 2 bi1d
a -> b -> c
4 1, 3 mpd
a -> c

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)