The space-time symmetry, the internal symmetry and the relation between the symmetries and the groups are discussed.
分别讨论了时空对称性和内部对称性及其与数学中的群的关系。
Characteristic of space time magnitude in precursor field, mechanism of precursor anomaly, earthquake preparation, and relation between field and epicenter are analyzed.
分析了前兆场的时空强特征、前兆异常机理、孕震过程及场源关系。
The close relation of origin is shown between the iron-formation and the sedimentary cycle in time, space and compositional source.
含铁建造与沉积旋回在时空和物源上存在着密切的成因联系。
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