set A = Topology_of T;
deffunc H₁( Element of Topology_of T, Element of Topology_of T) -> Element of Topology_of T = $1 /\ $2;
thus for o1, o2 being BinOp of (Topology_of T) st ( for a, b being Element of Topology_of T holds o1 . a,b = H₁(a,b) ) & ( for a, b being Element of Topology_of T holds o2 . a,b = H₁(a,b) ) holds
o1 = o2 from BINOP_2:sch 2(); :: thesis: verum