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Note 0 经典场论对应的拉格朗日力学
source link: https://zhuanlan.zhihu.com/p/33663588
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1、力学基础在物理学中，最基本的经典力学量是作用量 S。作用量的定义是拉格朗日函数对时间的积分。S=\int Ldt\\ 拉格朗日函数 L=L(q_\alpha,\dot q_\alpha,t) 是一个力学系统的特性函数，包含了一个力学系统的全…
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