使用正则表达式、枚举、联合、列表和置换组的说明。
Explanation of using regular expressions, enumerations, unions, lists, and substitution groups.
如何使用正则表达式(字符串范式)、枚举、联合、列表以及置换组？
How to use regular expressions (string patterns), enumerations, unions, lists, and substitution groups?
证明置换理想上的正则矩阵可以通过满矩阵对角化。
We show that every regular matrix over exchange ideals admits a diagonal reduction by full matrices.
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