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Syntax Definition wfn 4897
Description: Extend the definition of a wff to include the function predicate with a domain. (Read:  A is a function on  B.)
Hypotheses
Ref Expression
cA  class  A
cB  class  B
Assertion
Ref Expression
wfn  wff  A  Fn  B

See definition df-fn 4905 for more information.

Colors of variables: wff set class
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