Theorem funrel

Description: A function is a relation. (Contributed by NM, 1-Aug-1994)

	Ref	Expression
Assertion	funrel	|- ( Fun A -> Rel A )

Proof

Step	Hyp	Ref	Expression
1		df-fun	|- ( Fun A <-> ( Rel A /\ ( A o. `' A ) C_ _I ) )
2	1	simplbi	|- ( Fun A -> Rel A )