For the equations course, I was given a set of unpublished lectures that emphasized existence proofs and uniqueness of solutions to differential equations.

在方程课上，我听了一系列未公开的演讲，强调的是微分方程的解的存在证明及其唯一性。

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Also this paper presents the structure of mathematical vessel-model and the existence and uniqueness of the solution and introduces a set of numerical methods to solve the smoothed-spline Surface.

探索和研究了数学船型构造及解的存在、唯一性，且建立了一套求光顺样条曲面的数值方法。

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The properties that make up an entity key should be chosen to guarantee uniqueness of instances in an entity set.

在选择构成实体键的属性时应确保实例在实体集中的唯一性。

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