Legend for IPS symbols Addition Point y = x2 - x1 Filled sectors denote inversion (here: subtraction) Empty input signals are neutral (here 0) Multiplication Point y = x2 / x1 Filled sectors denote inversion (here: division) Empty input signals are neutral (here 1) Constant Gain y = Gx Special Function y = sqrt(x) -> Legend for network symbols at OEP   Top : Resources : IPS : legend