In October there will be seen the firstvariation in the position of the polar star in relation to the lines from the Great Pyramid.
将在10月看见在那里北极星的位置到大金字塔连线的第一变化。
2
It is proved that the vanishing of the firstvariation of the functional J is equivalent to all the equations which should be satisfied in the dynamics of rigid-plastic continua.
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。
3
First-order change is a variation in the way processes and procedures have been done in a given system, leaving the system itself relatively unchanged.