theorem pi222pr (a b c d: nat): $ pi222 (a, b, c, d) = d $;
| Step | Hyp | Ref | Expression |
|---|
| 1 |
|
eqtr |
pi222 (a, b, c, d) = snd (c, d) -> snd (c, d) = d -> pi222 (a, b, c, d) = d |
| 2 |
|
sndeq |
pi22 (a, b, c, d) = c, d -> snd (pi22 (a, b, c, d)) = snd (c, d) |
| 3 |
2 |
conv pi222 |
pi22 (a, b, c, d) = c, d -> pi222 (a, b, c, d) = snd (c, d) |
| 4 |
|
pi22pr |
pi22 (a, b, c, d) = c, d |
| 5 |
3, 4 |
ax_mp |
pi222 (a, b, c, d) = snd (c, d) |
| 6 |
1, 5 |
ax_mp |
snd (c, d) = d -> pi222 (a, b, c, d) = d |
| 7 |
|
sndpr |
snd (c, d) = d |
| 8 |
6, 7 |
ax_mp |
pi222 (a, b, c, d) = d |
Axiom use
axs_prop_calc
(ax_1,
ax_2,
ax_3,
ax_mp,
itru),
axs_pred_calc
(ax_gen,
ax_4,
ax_5,
ax_6,
ax_7,
ax_10,
ax_11,
ax_12),
axs_set
(elab,
ax_8),
axs_the
(theid,
the0),
axs_peano
(peano1,
peano2,
peano5,
addeq,
muleq,
add0,
addS,
mul0,
mulS)