theorem lenlfn (F: set) (n: nat): $ len (lfn F n) = n $;
| Step | Hyp | Ref | Expression |
|---|
| 1 |
|
lfnauxlen |
len (lfnaux F 0 n) = n |
| 2 |
1 |
conv lfn |
len (lfn F n) = n |
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)