theorem a2d (a b c d: wff): $ a -> b -> c -> d $ > $ a -> (b -> c) -> b -> d $;
| Step | Hyp | Ref | Expression |
|---|
| 1 |
|
ax_2 |
(b -> c -> d) -> (b -> c) -> b -> d |
| 2 |
|
hyp h |
a -> b -> c -> d |
| 3 |
1, 2 |
syl |
a -> (b -> c) -> b -> d |
Axiom use
axs_prop_calc
(ax_1,
ax_2,
ax_mp)