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Syntax Definition wfo 5499
Description: Extend the definition of a wff to include onto functions. (Read: maps onto .) The notation ("onto" below the arrow) is from Definition 6.15(4) of [TakeutiZaring] p. 27.
Hypotheses
Ref Expression
cA
cB
cF
Assertion
Ref Expression
wfo

See definition df-fo 5507 for more information.

Colors of variables: wff set class
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