Definition df-ord 5939

Description: Define the ordinal predicate, which is true for a class that is transitive and is well-ordered by the epsilon relation. Variant of definition of [BellMachover] p. 468. (Contributed by NM, 17-Sep-1993.)

Assertion

Ref	Expression
df-ord	⊢ (Ord 𝐴 ↔ (Tr 𝐴 ∧ E We 𝐴))

Detailed syntax breakdown of Definition df-ord

Step	Hyp	Ref	Expression
1		cA	. . 3 class 𝐴
2	1	word 5935	. 2 wff Ord 𝐴
3	1	wtr 4946	. . 3 wff Tr 𝐴
4		cep 5223	. . . 4 class E
5	1, 4	wwe 5269	. . 3 wff E We 𝐴
6	3, 5	wa 384	. 2 wff (Tr 𝐴 ∧ E We 𝐴)
7	2, 6	wb 197	1 wff (Ord 𝐴 ↔ (Tr 𝐴 ∧ E We 𝐴))

This definition is referenced by:  ordeq  5943  ordwe  5949  ordtr  5950  trssord  5953  ordelord  5958  ord0  5989  ordon  7208  dfrecs3  7701  dford2  8760  smobeth  9689  gruina  9921  dford5  31925  dford5reg  32002  dfon2  32012