?圈积
... local product; native product 土货 loop product; wreath product 圈积 product by product reduction of tariff 产品对产品减税方式 ...
限制卷积
广义圈积
群的圈积
It is, he says, all to do with symmetry (technically, with something called the wreath product of symmetry groups).
ECONOMIST: The mathematics of voting
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。