wfn - Metamath Proof Explorer

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Syntax Definition wfn 6413

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 6421 for more information.

Colors of variables: wff setvar class