Syntax Definition wfo 4900

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 4908 for more information.