theorem eorda (a b c d: wff):
$ a /\ b -> d $ >
$ a /\ c -> d $ >
$ a -> b \/ c -> d $;
| Step | Hyp | Ref | Expression |
|---|
| 1 |
|
hyp h1 |
a /\ b -> d |
| 2 |
1 |
exp |
a -> b -> d |
| 3 |
|
hyp h2 |
a /\ c -> d |
| 4 |
3 |
exp |
a -> c -> d |
| 5 |
2, 4 |
eord |
a -> b \/ c -> d |
Axiom use
axs_prop_calc
(ax_1,
ax_2,
ax_3,
ax_mp)