touch Two curves that intersect at a point touch at that point if they also have a common tangent line. This means their order of contact is at least 1. This generalizes to two smooth manifolds of any dimension touching.
touch
数学辞典收录了4151条数学词条，基本涵盖了常用数学知识及数学英语单词词组的翻译及用法，是数学学习的有利工具。