通过严格求解广义协变的电子运动方程，讨论了强激光等离子体中自由电子的经典行为。
The classical behavior of a free electron in a strong laser plasma is discussed by solving the generally-covariant equation of motion for an electron.
证明了泛函j的一次变分为零相当于满足刚塑性体动力学的全部方程。
It is proved that the vanishing of the first variation of the functional J is equivalent to all the equations which should be satisfied in the dynamics of rigid-plastic continua.
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