theorem trueeq (_n1 _n2: nat): $ _n1 = _n2 -> (true _n1 <-> true _n2) $;
| Step | Hyp | Ref | Expression |
|---|
| 1 |
|
id |
_n1 = _n2 -> _n1 = _n2 |
| 2 |
1 |
trueeqd |
_n1 = _n2 -> (true _n1 <-> true _n2) |
Axiom use
axs_prop_calc
(ax_1,
ax_2,
ax_3,
ax_mp),
axs_pred_calc
(ax_gen,
ax_4,
ax_5,
ax_6,
ax_7)