reserve x,y for set,
  i for Nat;
reserve V for non empty CLSStruct,
  u,v,v1,v2,v3 for VECTOR of V,
  A for Subset of V,
  l, l1, l2 for C_Linear_Combination of A,
  x,y,y1,y2 for set,
  a,b for Complex,
  F for FinSequence of the carrier of V,
  f for Function of the carrier of V, COMPLEX;
reserve K,L,L1,L2,L3 for C_Linear_Combination of V;
reserve e,e1,e2 for Element of C_LinComb V;

theorem
  for V being ComplexLinearSpace, L being C_Linear_Combination of V st L
  is convex holds L <> ZeroCLC V
proof
  let V be ComplexLinearSpace;
  let L be C_Linear_Combination of V;
  assume L is convex;
  then
A1: Carrier L <> {} by Th77;
  assume L = ZeroCLC V;
  hence contradiction by A1;
end;
