Theorem cmidi

Description: The commutes relation is reflexive. (Contributed by NM, 7-Aug-2004) (New usage is discouraged.)

	Ref	Expression
Hypothesis	cmid.1	|- A e. CH
Assertion	cmidi	|- A C_H A

Proof

Step	Hyp	Ref	Expression
1		cmid.1	|- A e. CH
2		ssid	|- A C_ A
3	1 1 2	lecmii	|- A C_H A