reserve a,a1,a2,v,v1,v2,x for object;
reserve V,A for set;
reserve m,n for Nat;
reserve S,S1,S2 for FinSequence;
reserve D,D1,D2 for NonatomicND of V,A;

theorem Th36:
  D1 tolerates D2 implies D1 \/ D2 is NonatomicND of V,A
  proof
    set D = D1 \/ D2;
    assume
A1: D1 tolerates D2;
    then
A2: D is Function by PARTFUN1:51;
    consider S1 being FinSequence such that
A3: S1 IsNDRankSeq V,A and
A4: D1 in Union S1 by Def5;
    consider S2 being FinSequence such that
A5: S2 IsNDRankSeq V,A and
A6: D2 in Union S2 by Def5;
    S1 c= S2 or S2 c= S1 by A3,A5,Th22;
    hence thesis by A1,A2,A3,A4,A5,A6,Th35,Def5;
  end;
