function title = p21_title ( )

%*****************************************************************************80
%
%% p21_title returns the title of problem 21.
%
%  Licensing:
%
%    This code is distributed under the MIT license.
%
%  Modified:
%
%    09 April 2007
%
%  Author:
%
%    John Burkardt
%
%  Output:
%
%    string TITLE, the title of the problem.
%
  title = 'f(x,y) = 1 / r = 1 / sqrt ( x^2 + y^2 )';

  return
end
