Theorem booleq ≪ | index | src | ≫

theorem booleq (_n1 _n2: nat): $ _n1 = _n2 -> (bool _n1 <-> bool _n2) $;

Step	Hyp	Ref	Expression
1		id	_n1 = _n2 -> _n1 = _n2
2	1	booleqd	_n1 = _n2 -> (bool _n1 <-> bool _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), axs_peano (peano2, addeq)