... additive identity 加法恒等元,加法单位... identity equation 计量经济或经济统计中... identity element 单位元素 ...
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The Beautiful Equation: Euler's identity.
上图:美丽的欧拉等式。
Equation is different from arithmetic identity in that it contains unknown quantity which can join operations.
方程与算数的等式不同在于它含有可以参加运算的未知量。
A power-like equation, a Virial-like theorem, an integral variational principle and a differential variational principle for the system are deduced by using the time-integral identity.
给出系统的时间积分等式,并由此等式导出类能量方程、类维里定理、一个积分变分原理和一个微分变分原理。
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