Theorem funcdm ≪ | index | src | ≫

theorem funcdm (A B F: set): $ func F A B -> Dom F == A $;

Step	Hyp	Ref	Expression
1		anlr	isfun F /\ Dom F == A /\ Ran F C_ B -> Dom F == A
2	1	conv func	func F A B -> Dom F == A

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)