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Syntax Definition wfn 5781
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 5789 for more information.

Colors of variables: wff setvar class
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