Syntax Definition wfo 5121

Description: Extend the definition of a wff to include onto functions. (Read: 𝐹 maps 𝐴 onto 𝐵.) The notation ("onto" below the arrow) is from Definition 6.15(4) of [TakeutiZaring] p. 27.

Hypotheses

Ref	Expression
cA	class 𝐴
cB	class 𝐵
cF	class 𝐹

Assertion

Ref	Expression
wfo	wff 𝐹:𝐴–onto→𝐵

See definition df-fo 5129 for more information.