Theorem pwidgOLD

Description: Obsolete version of pwidg as of 10-Jun-2026. (Contributed by Stefan O'Rear, 1-Feb-2015) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Assertion	pwidgOLD	|- ( A e. V -> A e. ~P A )

Proof

Step	Hyp	Ref	Expression
1		ssid	|- A C_ A
2		elpwg	|- ( A e. V -> ( A e. ~P A <-> A C_ A ) )
3	1 2	mpbiri	|- ( A e. V -> A e. ~P A )