Group theory is the branch of mathematics that studies symmetry, found in crystals, art, architecture, music and many other contexts. But its beauty is lost on students when it is taught in a technical style that is difficult to understand. Visual Group Theory assumes only a high school mathematics background and covers a typical undergraduate course in group theory from a thoroughly visual perspective.
The more than 300 illustrations in Visual Group Theory bring groups, subgroups, homomorphisms, products, and quotients into clear view. Every topic and theorem is accompanied with a visual demonstration of its meaning and import, from the basics of groups and subgroups through advanced structural concepts such as semidirect products and Sylow theory.
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每个群元既可以看做元素,也可以看做从单位元到它的一种操作。右乘一个群元就是按从单位元到该群元的操作运行一次,右乘一个群就是把群的结构搬到新位置,左乘就按“被”右乘理解。正式学群论之前都该读这本书啊,没有凯利图光凭抽象代数是不可能形成对群基本结构的直观概念的,不过新问题是,凯利图是用对称性来解释对称性,群论的上位学科莫非是拓扑学?以及关键的群表示什么的凯利图管不了,还是学不懂啊(掩面)
评分网上有作者自己做的ppt课件,可以搜一下,简单的地方看课件就行了,稍微需要思索的地方再看书,同时该书有配套的网站,对于常见的群的Cayley图,子群,自循环图等都有收录,对初学者非常友好。最后,文章对于Calois theory 的介绍,非常通俗易懂。
评分虽然一开始就上凯利图确实不太适应我的思维习惯,但如是第一本就看它就很不错哦;(另:入了formal的坑三年才搞清大致概况,还没入坑的同学慎入,有太多数学工具需要补;突然怀念起以前简简单单有明确边界的工作,但入了此坑后无论是db还是compiler领域都无法让我兴奋。。。;)
评分Group theory is not primarily about numbers, but rather about patterns and symmetry; something the Rubik's Cube possesses in abundance.The offcial name of the type of group road map that we have just created is Cayley diagram。
评分写的非常适合自学,后面两章sylow 定理和Galois定理仍然不好读。。
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