positive definite function meaning in English

正定函数

Irreducible positive definite function on unimodular group and its applications
幺模群上的不可分解正定函数及其应用
The title is intimidating , but chapter 3 is easy to read and contains a lucid introduction to positive definite functions
不要被书名吓到了，其实书里的第3章非常容易阅读而且对正定函数也有很明确的解释。
We prove the equivalent conditions of completely monotone function , we also discuss the relationship of positive definite function , semi - positive definite function and completely monotone function when the function take values in a commutitive von neumann algebras
我们证明了完全单调函数的几个等价条件，并且讨论了取值于交换vonneumann代数的正定函数，半正定函数及完全单调函数之间的关系。
For elastic reigistration of non - rig id body , after the thin - plate splines for image registration is analysed , the local elastic registration is presented , which usilizes a positive definite function with compact support as the radial basis function of interpolation
对于非刚性物体图像的弹性配准，本文先分析了基于薄板样条弹性配准方法，总结了其不足之处，通过采用一种紧支正定函数作为插值方法中的径向基函数，实现了图像的局部弹性配准。