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Syntax Definition wfr 4065
Description: Extend wff notation to include the well-founded predicate. Read: '  R is a well-founded relation on 
Ref Expression
cA  class  A
cR  class  R
Ref Expression
wfr  wff  R  Fr  A

See definition df-frind 4069 for more information.

Colors of variables: wff set class
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