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.
A rectifier is an electronic device that changes alternating current into direct current. This process is called rectification. The three main types of rectifier are as follows-. Half-wave rectifier: It is the simplest type of rectifier, which is made with just one diode. i.When the voltage of the alternating current is positive, the diode becomes forward-biased and current flows through it. ii.he three main types of rectifier are as follows-. Half-wave rectifier: It is the simplest type of rectifier, which is made with just one diode. i. When the voltage of the alternating current is positive, the diode becomes forward-biased and current flows through it. ii.