Theorem unicntop

Description: The underlying set of the standard topology on the complex numbers is the set of complex numbers. (Contributed by Glauco Siliprandi, 11-Dec-2019)

	Ref	Expression
Assertion	unicntop	|- CC = U. ( TopOpen ` CCfld )

Proof

Step	Hyp	Ref	Expression
1		eqid	|- ( TopOpen ` CCfld ) = ( TopOpen ` CCfld )
2	1	cnfldtopon	|- ( TopOpen ` CCfld ) e. ( TopOn ` CC )
3	2	toponunii	|- CC = U. ( TopOpen ` CCfld )