Definition df-he 41270

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

Assertion

Ref	Expression
df-he	⊢ (𝑅 hereditary 𝐴 ↔ (𝑅 “ 𝐴) ⊆ 𝐴)

Detailed syntax breakdown of Definition df-he

Step	Hyp	Ref	Expression
1		cA	. . 3 class 𝐴
2		cR	. . 3 class 𝑅
3	1, 2	whe 41269	. 2 wff 𝑅 hereditary 𝐴
4	2, 1	cima 5583	. . 3 class (𝑅 “ 𝐴)
5	4, 1	wss 3883	. 2 wff (𝑅 “ 𝐴) ⊆ 𝐴
6	3, 5	wb 205	1 wff (𝑅 hereditary 𝐴 ↔ (𝑅 “ 𝐴) ⊆ 𝐴)

This definition is referenced by:  dfhe2  41271  dfhe3  41272  heeq12  41273  sbcheg  41276  hess  41277  xphe  41278  0he  41279  he0  41281  unhe1  41282  snhesn  41283  dffrege76  41436