theorem pncan2 (a b: nat): $ a + b - a = b $;
Step | Hyp | Ref | Expression |
1 |
|
|
a + b = a + b -> a + b - a = b |
2 |
|
|
|
3 |
|
|
|
Axiom use
axs_prop_calc (+5)
(ax_1,
ax_2,
ax_3,
ax_mp,
itru),
axs_pred_calc (+8)
(ax_gen,
ax_4,
ax_5,
ax_6,
ax_7,
ax_10,
ax_11,
ax_12),
axs_set (+2)
(elab,
ax_8),
axs_the (+1)
(theid),
axs_peano (+5)
(peano2,
peano5,
addeq,
add0,
addS)