The existence and uniqueness of universal unfolding are proved.
证明了万有开折的存在性和唯一性。
The existence and uniqueness of limit cycles of a biochemical system is proved.
本文研究一类生化系统的极限环的存在性与唯一性；
The existence and uniqueness of double degenerate parabolic equation are considered.
讨论双退化抛物型方程解的存在性和唯一性。
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