End emptyfn_2.

(* Specifications: *)
Theorem empty_function_well_definedness : well_definedness Zero.
Proof
fun (X Y Z : Ens) (i : IN (PAIR X Y) Zero) (j : IN (PAIR X Z) Zero) =>
emptyfn2_Out X Y Z i.
Theorem empty_function_function : is_a_function Zero.
Proof
Build_is_a_function Zero empty_function_relation
empty_function_well_definedness.