Theorem 0leop

Description: The zero operator is a positive operator. (The literature calls it "positive", even though in some sense it is really "nonnegative".) Part of Example 12.2(i) in Young p. 142. (Contributed by NM, 23-Jul-2006) (New usage is discouraged.)

	Ref	Expression
Assertion	0leop	|- 0hop <_op 0hop

Proof

Step	Hyp	Ref	Expression
1		0hmop	|- 0hop e. HrmOp
2		leoprf	|- ( 0hop e. HrmOp -> 0hop <_op 0hop )
3	1 2	ax-mp	|- 0hop <_op 0hop