Theorem mtand | index | src |

theorem mtand (a b c: wff): $ a -> ~b $ > $ a /\ c -> b $ > $ a -> ~c $;
StepHypRefExpression
1 hyp h1
a -> ~b
2 hyp h2
a /\ c -> b
3 2 exp
a -> c -> b
4 1, 3 mtd
a -> ~c

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)