单词：elliptic equation
elliptic equation的用法和样例：
例句
- In chapter two, we prove the existence of nontrivial solutions for the elliptic equation of high order.在第二章中，我们讨论了一类高阶椭圆方程，并且证明了多解的存在性问题。
- It is known that there are many methods to study the convexity for second order elliptic PDE.摘要对于半线性二阶椭圆方程，已有多种方法研究其解的凸性。
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