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Metamath Proof Explorer

Theorem fnbigcup

Description: Bigcup is a function over the universal class. (Contributed by Scott Fenton, 11-Apr-2012)

		Ref	Expression
	Assertion	fnbigcup	⊢ Bigcup Fn V

Step	Hyp	Ref	Expression
1		fobigcup	⊢ Bigcup : V –onto→ V
2		fofn	⊢ ( Bigcup : V –onto→ V → Bigcup Fn V )
3	1 2	ax-mp	⊢ Bigcup Fn V