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theorem leeq2 (a _b1 _b2: nat): $ _b1 = _b2 -> (a <= _b1 <-> a <= _b2) $;

Step	Hyp	Ref	Expression
1		id	_b1 = _b2 -> _b1 = _b2
2	1	leeq2d	_b1 = _b2 -> (a <= _b1 <-> a <= _b2)

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 (addeq)