Definition df-ord 2978

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.

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 2974	. 2 wff Ord A
3	1	wtr 2754	. . 3 wff Tr A
4		cep 2908	. . . 4 class E
5	1, 4	wwe 2946	. . 3 wff E We A
6	3, 5	wa 221	. 2 wff (Tr A /\ E We A)
7	2, 6	wb 144	1 wff (Ord A <-> (Tr A /\ E We A))

This definition is referenced by:  ordeq 2982  ordwe 2988  ordtr 2989  trssord 2992  ordelord 2997  ord0 3025  ordon 3141

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