费曼路径积分的变分方法是计算束缚极化子基态能的最有效方法。
The Feynman path-integral variational theory is the best way to compute the ground-state energy of bound polarons.
本文介绍了费曼路径积分的基本概念和方法，并以谐振子为例说明了它的应用。
In this paper the fundamental concepts and methods of the Feynman path integrals are presented. Their applications are explained by harmonic oscillator as an example.
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