图2 (IMAGE) Science China Press Caption 向量空间、边界算子和相关子空间的关系示意图(其中Zk是圈群,Yk是边界群)。 Credit ©《中国科学》杂志社 Usage Restrictions Use with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.