reserve k,n for Nat,
  x,y,z,y1,y2 for object,X,Y for set,
  f,g for Function;
reserve p,q,r,s,t for XFinSequence;
reserve D for set;

theorem
  <%x,y,z%>=<%x%>^<%y,z%> & <%x,y,z%>=<%x,y%>^<%z%> by Th25;
