deffunc H₁( NatPlus, NatPlus) -> Element of omega = $1 lcm $2;
thus for o1, o2 being BinOp of NATPLUS st ( for a, b being NatPlus holds o1 . (a,b) = H₁(a,b) ) & ( for a, b being NatPlus holds o2 . (a,b) = H₁(a,b) ) holds
o1 = o2 from BINOP_2:sch 2(); :: thesis: verum