四边形不等式
四边形不等式-
我们的研究主要以Banach空间几何学，平行四边形不等式，对偶映射的估计，Banach空间中的非标准Lyapunov泛函，以及微分不等式解的估计等为基础，来获得预期的结果。
Our research is based on a new technique using Banach space geometry , parallelogram inequalities , estimates of duality mappings , nonstandard Lyapunov functionals in Banach space , and estimates of solutions to differential inequalities to achieve the prospective result .
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本文首先使用初等方法导出三角形与四边形的等周不等式，进而用富里埃级数方法解决了一般等周问题。
We deduced equal perimeter inequality of triangle and quadrangle by elementary mathematical methods first and solved general equal perimeter problems by using methods of Fourier series .