Cynosure对《控制论与科学方法论》的笔记(1)
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P20 共轭控制 当人们要扩大控制范围的时候，通常使用一种叫做“共轭控制”的方法。 L：把大象的重量变成石头的重量 A：称出石头的重量 L($^{-1}$):把石头的重量变成大象的重量 数学上把LAL($^{-1}$)称作A过程的共轭过程。 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 在这里有理由认为LAL($^{-1}$)= L($^{-1}$)AL，所以。。。。LAL($^{-1}$) 这不就是群论里的normal subgroup吗？！伽罗瓦当初认识到aH=Ha所定义的子群有更重要的性质，原因就在这里啊。 homomorphism是相似变换 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
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