If my poor Flatland friend retained the vigour of mind which he enjoyed when he began to compose these Memoirs, I should not now need to represent him in this preface, in which he desires, firstly, to return his thanks to his readers and critics in Spaceland, whose appreciation has, with unexpected celerity, required a second edition of his work; secondly, to apologize forcertain errors and misprints (for which, however, he is not entirely responsible); and, thirdly, to explain one or two misconceptions. But he is not the Square he once was. Years of imprisonment, and the still heavier burden of general incredulity and mockery, have combined with the natural decay of old age to erase from his mind many of the thoughts and notions, and much also of the terminology, which he acquired during his short stay in Spaceland. He has, therefore, requested me to reply in his behalf to two special objections, one of an intellectual, the other of a moral nature.
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讀後感
最近我读了一本非常有趣的科幻小说，是埃德温·艾勃特的《平面国》，正如书名所提示的那样，它主要描绘了一个处在二维空间中的国家，在那里一切都是平面的，甚至连人也是一样。也许我们这些处在三维空间的人会觉得他们可怜，但他们本身却是自有一番乐趣。 平面国的居民...
評分美剧《生活大爆炸》第三季的第12集，谢尔顿和拉杰在屋子里闲聊，拉杰说要出去找姑娘，谢尔顿说，每当他想换换脑子的时候，就假想自己到了平面国，到了一个二维的世界。这两位出去都找到了姑娘，有个姑娘告诉谢尔顿，艾勃特那本《平面国》，不仅是个数学小说，还与维多利亚时...
評分焦建/文 上完中学的几何课程之后，除了对数学有兴趣的人，估计不会有太多人还对于平面和纬度产生兴趣。作为一种理解更加艰深知识的工具，这些概念被当做一种学习的跳板。我们都记得的公理是——点移动成线，线移动成面，面移动成体。立体图形成为学习的核心，除此之外，其他的...
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