A set that is not convex is called a non-convex set. A polygon that is not a convex polygon is sometimes called a concave polygon, and some sources more generally use the term concave set to mean a non-convex set, but most authorities prohibit this usage.
In either case you don't need to deal with the absolute value. A rectified sine wave is a periodic signal with a period equal to half of the full sinusoid, I would write the sine in exponential form and integrate over one period to find the series coefficients.
1 A full-wave rectifier is a circuit that converts both half-cycles of the AC voltage waveform to an unbroken series of voltage pulses of the same polarity. 2  The resulting DC delivered to the load doesnât âpulsateâ as much.he current flow is through two diodes in series for both polarities. Thus, two diode drops of the source voltage are lost (0.7Â·2=1.4 V for Si) in the diodes. This is a disadvantage compared with a full-wave center-tap design.