Theorem qsex

Description: A quotient set exists. (Contributed by NM, 14-Aug-1995)

	Ref	Expression
Hypothesis	qsex.1	|- A e. _V
Assertion	qsex	|- ( A /. R ) e. _V

Proof

Step	Hyp	Ref	Expression
1		qsex.1	|- A e. _V
2		qsexg	|- ( A e. _V -> ( A /. R ) e. _V )
3	1 2	ax-mp	|- ( A /. R ) e. _V