Database
ZF (ZERMELO-FRAENKEL) SET THEORY
ZF Set Theory - add the Axiom of Power Sets
Founded and well-ordering relations
wefr
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weso
Metamath Proof Explorer
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Unicode
Theorem
wefr
Description:
A well-ordering is well-founded.
(Contributed by
NM
, 22-Apr-1994)
Ref
Expression
Assertion
wefr
⊢
R
We
A
→
R
Fr
A
Proof
Step
Hyp
Ref
Expression
1
df-we
⊢
R
We
A
↔
R
Fr
A
∧
R
Or
A
2
1
simplbi
⊢
R
We
A
→
R
Fr
A