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Theorem ordfr 4539
Description: Epsilon is well-founded on an ordinal class. (Contributed by NM, 22-Apr-1994.)
Assertion
Ref Expression
ordfr  |-  ( Ord 
A  ->  _E  Fr  A )

Proof of Theorem ordfr
StepHypRef Expression
1 ordwe 4537 . 2  |-  ( Ord 
A  ->  _E  We  A )
2 wefr 4515 . 2  |-  (  _E  We  A  ->  _E  Fr  A )
31, 2syl 16 1  |-  ( Ord 
A  ->  _E  Fr  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    _E cep 4435    Fr wfr 4481    We wwe 4483   Ord word 4523
This theorem is referenced by:  ordirr  4542  tz7.7  4550  onfr  4563  bnj580  28624  bnj1053  28685  bnj1071  28686
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 178  df-an 361  df-we 4486  df-ord 4527
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