Theorem funceq2d | index | src |

theorem funceq2d (_G: wff) (F _A1 _A2 B: set):
  $ _G -> _A1 == _A2 $ >
  $ _G -> (func F _A1 B <-> func F _A2 B) $;
StepHypRefExpression
1 eqsidd
_G -> F == F
2 hyp _h
_G -> _A1 == _A2
3 eqsidd
_G -> B == B
4 1, 2, 3 funceqd
_G -> (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)