let S be non empty set ; :: thesis: ex o being UnOp of (ModelSP S) st
for f being set st f in ModelSP S holds
o . f = Not_0 f,S
set M = ModelSP S;
deffunc H₁( set ) -> Element of ModelSP S = Not_0 $1,S;
ex o being UnOp of (ModelSP S) st
for f being set st f in ModelSP S holds
o . f = H₁(f) from MODELC_1:sch 4();
hence ex o being UnOp of (ModelSP S) st
for f being set st f in ModelSP S holds
o . f = Not_0 f,S ; :: thesis: verum