唯一性

Parabolic equation ; European option ; volatility ; existence ; uniqueness ; necessary condition

抛物型方程；欧式期权；波动率；存在性；唯一性；必要条件

Equivariant bifurcation problem; contact equivalent group; classification; recognition; left-right equivalent group; versal unfolding; uniquiness; stability

基础科学，数学，概率论、数理统计等变分歧问题；接触等价群；分类；识别；左右等价群；通用开折；唯一性；稳定性

Firstly, the lake water quality model is developed under the condition of both internal and external pollution by using the method of microelement analysis, then homogenizes the non-cylindrical boundary condition and utilizes the methods of vector expending and pseudomonotone of the variational operator, and last the existence and uniqueness of the solution for a type free initial-boundary value problem is obtained.

本文首先运用微元分析法导出在外源和内源双重污染下湖泊水质模型，然后对一类自由初边值问题通过对非柱形边界条件的齐次约化，运用变分型算子的向量扩张和拟单调方法获得解的存在性、唯一性。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。