theorem Th11:
  for p being PartState of S, d being data-only PartState of S
  holds IC(p+*d) = IC p
proof
  let p be PartState of S, d be data-only PartState of S;
A1: not IC S in dom d by Th10;
  thus IC(p+*d) = IC p by A1,FUNCT_4:11;
end;
