由上述性质可知，DFC在处理不稳定不动点（UFPs，Unstable Fixed Points）的镇定问 题时，对于离散系统，可取τ = 1 ；对于连续系统，τ 可以是任意值.
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讨论了不稳定不动点邻域的不稳定轨道的稳定问题。
The stabilization of an unstable periodic orbit in a neighborhood of an unstable fixed point is studied.
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。
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.
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