Theorem ordfr 6372

Description: Membership is well-founded on an ordinal class. In other words, an ordinal class is well-founded. (Contributed by NM, 22-Apr-1994.)

Assertion

Ref	Expression
ordfr	⊢ (Ord 𝐴 → E Fr 𝐴)

Proof of Theorem ordfr

Step	Hyp	Ref	Expression
1		ordwe 6370	. 2 ⊢ (Ord 𝐴 → E We 𝐴)
2		wefr 5649	. 2 ⊢ ( E We 𝐴 → E Fr 𝐴)
3	1, 2	syl 17	1 ⊢ (Ord 𝐴 → E Fr 𝐴)

Syntax hints:   → wi 4   E cep 5557   Fr wfr 5608   We wwe 5610  Ord word 6356

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 207  df-an 396  df-we 5613  df-ord 6360

This theorem is referenced by:  ordirr  6375  tz7.7  6383  onfr  6396  bnj580  34949  bnj1053  35012  bnj1071  35013