A convex function is a real-valued function defined on an interval with the property that its epigraph (the set of points on or above the graph of the function) is a convex set.
A rectifier is a electrical device that converts alternating current to direct current, a process known as rectification. Rectifiers are used as components of power supplies and as detectors of radio signals. Rectifiers may be made of solid state diodes, vacuum tube diodes, mercury arc valves, and other technologies.
Noun. 1. rectifier-electrical device that transforms alternating into direct current. demodulator, detector-rectifier that extracts modulation from a radio carrier wave. electrical device-a device that produces or is powered by electricity.