reserve A,B,O for Ordinal,
        o for object,
        x,y,z for Surreal,
        n,m for Nat;
reserve d,d1,d2 for Dyadic;
reserve i,j for Integer,
        n,m,p for Nat;
reserve r,r1,r2 for Real;

theorem Th76:
  x in Day A implies x <= No_uOrdinal_op A
proof
  assume x in Day A;
  then x <= No_Ordinal_op A == No_uOrdinal_op A by Th69,Th73;
  hence thesis by SURREALO:4;
end;
