function even = even(integer_n)
  ## Returns true if its argument is even; false otherwise.
  ##
  ## INPUTS:
  ##
  ##   * ``integer_n`` - The integer whose parity you're determining.
  ##
  ##
  ## OUTPUTS:
  ##
  ##   * ``even`` - True if `integer_n` is even, false otherwise.
  ##
  even = rem(integer_n, 2) == 0;
end
