Renegade: In other words, you don't need to donate it back by offering your derivative work under the same license, as you do with GPL [General Public License] and to a lesser extent with the LGPL.

General business and investors have very little contact with derivative financial instruments, let alone to use it in the financial activities to hedge and gain profits.

The general formula of TEF's derivative for multi machine system is deduced, and taking single machine infinitive bus system as example, the effect of the designeds...