text: abstract—in this paper, by way of three examples – a fourth
  order low pass active rc filter, a rudimentary bjt amplifier,
  and an lc ladder – we show, how the algebraic capabilities of
  modern computer algebra systems can, or in the last example,
  might be brought to use in the task of designing analog circuits.
  acm classification: i.1 symbolic and algebraic manipulation; j.2
  physical sciences and engineering; g.2.2 graph theory
  mathematics subject classification (2000): primary 94c05; secondary 94c15, 68w30, 13p10, 05c85
  keywords: analog circuits, filter design, polynomial equations, computer algebra, delta-wye transformation.