Theorem obindeq2 ≪ | index | src | ≫ 

theorem obindeq2 (a: nat) (_F1 _F2: set):
  $ _F1 == _F2 -> obind a _F1 = obind a _F2 $;
StepHypRefExpression
1 id 
_F1 == _F2 -> _F1 == _F2
2 1 obindeq2d 
_F1 == _F2 -> obind a _F1 = obind a _F2

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 (peano2, addeq, muleq)