theorem Th22:
  S-bound C <= N-bound C
proof
A1: W-min C in C by Th13;
  then
A2: (W-min C)`2 <= N-bound C by PSCOMP_1:24;
  S-bound C <= (W-min C)`2 by A1,PSCOMP_1:24;
  hence thesis by A2,XXREAL_0:2;
end;
