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.
Dehumidifiers remove some of the moisture from damp air. They help dry out musty, damp basements or can make a room feel more comfortable during humid weather if an air conditioner isn't available. dehumidifier helps keep the humidity level comfortable in your home. It may be used during humid weather, or in areas that smell musty or show signs of mold and mildew.