Theorem Bool0 ≪ | index | src | ≫

theorem Bool0: $ 0 e. Bool $;

Step	Hyp	Ref	Expression
1		elBool	0 e. Bool <-> bool 0
2		bool0	bool 0
3	1, 2	mpbir	0 e. Bool

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)