In this paper, the precise solution of a generalized time dependent harmonic oscillator is obtained by a sequence of unitary transformations and applied to construct the squeezed state of the system.

利用一系列幺正变换，求出了广义含时谐振子系统的精确解，并利用此精确解构造了此系统的压缩态。

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The woman who set out to change the system, he imagines, would have recognised the change from what we knew, a centralised unitary state to a devolved, increasingly federal way of governing, as a means of maintaining her belief in Britain.

BBC: Yes for Wales or no to Thatcherism?