我从et++中学到，一个成熟的框架总是明显地包含了很多重复出现的设计模式，可以让你得到更多的东西，像扩展性，解耦性，和最终的优雅性。
As I reflected on ET + +, it became apparent that a mature framework contains recurring design structures that give you properties like extensibility, decoupling, and last but not least, elegance.
最近20年，对这些问题的提法逐渐完善，解的存在性和数值方法方面已取得了许多重要进展。
The formulation for these problems has been perfected gradually, and there have been important advances in the existence of a solution and the numerical methods of these problems in the last 20 years.
讨论了四阶边值问题，通过应用一个新的三解定理，得到了其解的存在性与多重性。
By using a new three-solution theorem, we obtain the existence and multiplicity of positive solutions for fourth-order boundary value problem.
主要研究一类三阶两点边值问题变号解的存在性和多重性，利用不动点指数和拓扑度理论等得到了新的结论。
We show existence results for multiple sign-changing solution for third-order two- point boundary value problems by using the fixed point index and the topologic degree theory.
通过极小化作用原理和极小极大方法得到了一类四阶非线性椭圆方程解的存在性和多重性。
The existence and multiplicity results are obtained for a class of fourth-order nonlinear elliptic equations by the least action principle and the minimax methods, respectively.
这一工具可以用来检查多重复杂故障对于大型电力系统的非线性影响，还可用来检验严重故障下系统静态潮流解的存在性。
This proposed tool is designed to investigate the nonlinear effects of enforcing a multiple compound contingency in a large-scale power system.
通过应用一个新的三解定理，得到了边值问题多重正解的存在性。
Sufficient conditions are established for the multiplicity of solutions of this problem by using Leggett-Williams theorem.
用临界点理论中的极小极大方法得到了次线性椭圆方程Neumann问题多重解的存在性。
The existence of multiple solutions is obtained for Neumann problem of sublinear elliptic equations by the minimax methods in the critical point theory.
用临界点理论中的极小极大方法得到了次线性椭圆方程Neumann问题多重解的存在性。
The existence of multiple solutions is obtained for Neumann problem of sublinear elliptic equations by the minimax methods in the critical point theory.
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