Theorem funceq2 ≪ | index | src | ≫ 

theorem funceq2 (F _A1 _A2 B: set):
  $ _A1 == _A2 -> (func F _A1 B <-> func F _A2 B) $;
StepHypRefExpression
1 id 
_A1 == _A2 -> _A1 == _A2
2 1 funceq2d 
_A1 == _A2 -> (func F _A1 B <-> func F _A2 B)

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)