The Bethe ansatz equations are obtained from the periodic boundary conditions.
由周期边界条件推出贝特假设方程。
2
The basic idea of DFT is an ansatz, which assumes that any properties of many-body system can be determined by the ground state density.
密度泛函的基础是一个假定：假定一个多粒子体系的任何性质都是基态电子密度的函数。
3
Then, based on the fundamental equation, we present the chirped femtosecond soliton-like solution by ansatz method and discuss the transmission property of the soliton-like solution in optical fiber.