Metamath Proof Explorer

Syntax definition wf1o

Description: Extend the definition of a wff to include one-to-one onto functions. (Read: F maps A one-to-one onto B .) The notation ("1-1" above the arrow and "onto" below the arrow) is from Definition 6.15(6) of TakeutiZaring p. 27.

Ref Expression
Assertion wf1o wff F : A 1-1 onto B