Theorem funceq1d | index | src |

theorem funceq1d (_G: wff) (_F1 _F2 A B: set):
  $ _G -> _F1 == _F2 $ >
  $ _G -> (func _F1 A B <-> func _F2 A B) $;
StepHypRefExpression
1 hyp _h
_G -> _F1 == _F2
2 eqsidd
_G -> A == A
3 eqsidd
_G -> B == B
4 1, 2, 3 funceqd
_G -> (func _F1 A B <-> func _F2 A 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)