unsolvability

1. This paper discusses the drawing of hyperbola normal through a point outside the hyperbola and points out the unsolvability of geometric drawing method and the unintegrality of optimization method.
   对过双曲线外一定点的法线作图问题作了探讨，提出了几何作图法的不可解性及优化法解的不全性。
2. Quantitative Analysis and Online Recovering Control of Power Flow Unsolvability
   电力系统潮流计算不收敛的机理分析及其在线恢复控制
3. The unsolvability of implicit equations existing in the inversion algorithm in the inverse system method ( ISM) is considered, and a constructive inversion algorithm is presented for general nonlinear systems so as to avoid solving implicit equations via elimination method.
   针对由于逆系统方法之求逆算法中求解隐函数方程的困难，通过消元法避开对隐函数方法的求解，提出了一般非线性多变量系统的构造性求逆算法。

noun

1. the property (of a problem or difficulty) that makes it impossible to solve

   Synonym:    insolubility