知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，找到自己的解答」为品牌使命。知乎凭借认真、专. 《无限大的餐巾纸》 | evan chen（陳誼廷）的《an infinitely large napkin》，旨在（给高中生）介绍高等数学，900 多页的书几乎介绍了高等数学的每一个领域。全书开源可下载，网址： 链接 #高等数学.
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