……在学校里已经学到的东西，通常能帮到参加 Khan Academy 这类补充课程的学习者。一个真正出色的例子是顶尖数学家写的超棒数学教材，图全是手绘的：Robin Hartshorne 的《Geometry: Euclid and Beyond》。http://www.amazon.com/Geometry-Euclid-Beyond-Robin-Hartshorn... 作者解释了他为什么用手绘图而不是计算机生成的几何图……
…already gets in school generally helps learners in supplementary programs like Khan Academy. A really great example of a superb mathematics textbook by a top mathematician, all with hand-drawn diagrams, is Geometry: Euclid and Beyond by Robin Hartshorne. http://www.amazon.com/Geometry-Euclid-Beyond-Robin-Hartshorn... The author explains his rationale for having hand-drawn rather than computer-generated geometry…
一直如此。Robin Hartshorne 的《Geometry: Euclid and Beyond》是同类书里最好的。它用 Hilbert 公理来做欧几里得几何，还清理了欧几里得经典处理里的一些遗留问题。Hartshorne 这本书还涵盖了……
Always. Robin Hartshorne's "Geometry: Euclid and Beyond" is the best book of its kind. It does Euclidean geometry with Hilbert's axioms and cleans up some of the loose ends of Euclid's classical treatment. Hartshorns book also covered…
……在学校里已经学到的东西，通常能帮到参加 Khan Academy 这类补充课程的学习者。一个真正出色的例子是顶尖数学家写的超棒数学教材，图全是手绘的：Robin Hartshorne 的《Geometry: Euclid and Beyond》。http://www.amazon.com/Geometry-Euclid-Beyond-Robin-Hartshorn... 作者解释了他为什么用手绘图而不是计算机生成的几何图……
…already gets in school generally helps learners in supplementary programs like Khan Academy. A really great example of a superb mathematics textbook by a top mathematician, all with hand-drawn diagrams, is Geometry: Euclid and Beyond by Robin Hartshorne. http://www.amazon.com/Geometry-Euclid-Beyond-Robin-Hartshorn... The author explains his rationale for having hand-drawn rather than computer-generated geometry…
一直如此。Robin Hartshorne 的《Geometry: Euclid and Beyond》是同类书里最好的。它用 Hilbert 公理来做欧几里得几何，还清理了欧几里得经典处理里的一些遗留问题。Hartshorne 这本书还涵盖了……
Always. Robin Hartshorne's "Geometry: Euclid and Beyond" is the best book of its kind. It does Euclidean geometry with Hilbert's axioms and cleans up some of the loose ends of Euclid's classical treatment. Hartshorns book also covered…