Metamath Proof Explorer


Definition df-he

Description: The property of relation R being hereditary in class A . (Contributed by RP, 27-Mar-2020)

Ref Expression
Assertion df-he R hereditary A R A A

Detailed syntax breakdown

Step Hyp Ref Expression
0 cR class R
1 cA class A
2 1 0 whe wff R hereditary A
3 0 1 cima class R A
4 3 1 wss wff R A A
5 2 4 wb wff R hereditary A R A A