而由伽罗瓦和阿贝尔创立的群的结构并由克莱因提出的几何变换群理论为几何学从第二阶段到第三阶段的转变提供了依据。
The group which is founded by Galois and Abel and the theory which is proposed by Klein provide the tool from the second stage to the third stage of the geometry.
总结脑信息处理的三个特性：选择性、适应性及协同性，并论述了涵盖此三个特性的神经元群选择理论。
Three characteristics of brain information processing are summarized: selective, adaptable and cooperative, and neural-group. Selective theory including these characteristics is addressed.
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