Let G be a weighted graph with adjacency matrixA=[aij]. An Euclidean graph associated with a molecule is defined by a we......

本文通过对H2O分子结构特点及其几何对称变换问题的分析，阐明群论在分子结构与变换中的应用，通过实例对比，说明对称元素对对称性的影......

The present work explores a new phenomenon that not all the transition probability of two photon processes is negligible......