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Syntax Definition wfo 4590
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 4606 for more information.

Colors of variables: wff set class
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