A line chart connects a series of data points and is used by traders to monitor prices, currencies, indexes, and other data.

Time is a finite resource, but energy is different. It has four wellsprings—the body, emotions, mind, and spirit—and in each, it can be systematically expanded and renewed.

T-symmetry offers insights into the nature of time, revealing how fundamental physical laws remain invariant under time ...

Solar System Planets. Astronomy articles on the eight planets, plus the two dwarf planets, Pluto and Eris. Great pictures of everything in the solar system. Updated daily.

An approximate time-optimal control of a linear time invariant system consisting of a cascade of fast and slow subsystems is proposed.

2. Problem Formulation Typically, in the literature, assignment problems are described by resorting to a toy-example in which N jobs must be assigned to as many different workers or agents; this of ...