Theorem bicomd | index | src |

theorem bicomd (a b c: wff): $ a -> (b <-> c) $ > $ a -> (c <-> b) $;
StepHypRefExpression
1 bicom
(b <-> c) -> (c <-> b)
2 hyp h
a -> (b <-> c)
3 1, 2 syl
a -> (c <-> b)

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)