Addition:
(a + b) + c = a + (b + c)
Multiplication:
(a x b) x c = a x (b x c)
120 degree lagged signals can be obtained with the simple configuration shown in the figure....
This circuit was obtained from a Popular Electronics of the 80's. It is set to a certain pulse...
In the figure we have an application of ON Semiconductor's own semiconductor manual from the 80's....