“Evaporation is the removal of solvent as a vapor from a solution or slurry. The vapor may or may not be recovered, depending on its value. The end product may be a solid, but the transfer of heat in the evaporator must be to a solution or a suspension of the solid in liquid if the apparatus is not to be classed as a dryer. Evaporators are similar to stills or re-boilers of distillation
Definition A real-valued function V: X H R defined on state space X of a system with behavior set B and state r:B×[0,∞)→ X is called a Lyapunov function if tHv(t)=v(a(t))=v(a(z(), t)) is a non-increasing function of time for every z E B according to this definition, Lyapunov
7.1 concept learning 7.1.1 concept A concept is a category under which specific elements may be grouped.e.g. a red ball, a red pencil, and a red chair are all instances of the simple concept “red”. An “even number” is defined as any integer（整数） that is divisible by two without a remainder, and that an “odd number” is one that is not evenly(均匀地） divisible by two
