Metamath Proof Explorer


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 0 hop op 0 hop

Proof

Step Hyp Ref Expression
1 0hmop 0 hop HrmOp
2 leoprf 0 hop HrmOp 0 hop op 0 hop
3 1 2 ax-mp 0 hop op 0 hop