The stabilization of an unstable periodic orbit in a neighborhood of an unstable fixed point is studied.

讨论了不稳定不动点邻域的不稳定轨道的稳定问题。

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These transformations are made up of renormalization group. Then the fixed point of transformation can be found, among which those unstable ones are critical points of phase transition.

然后找出重整化变换的不动点，在所有不动点中那些不稳定不动点是发生相变的临界点。

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