这篇文章试图回答标题中的提问：矩阵乘法为什么是这样定义的？固然，数学中的名词定义都是人为的，有时它被定义得出乎意料以至于看似“随心所欲”，然而不合常理的定义绝不会有持久的生命力，早就被扫进了历史的垃圾箱。既然矩阵的乘法存在了至少一个半世纪，它就一定有 ...

诺贝尔物理学奖和化学奖被AI「包圆」后，人们再次确信：基础科学研究的范式，已经被AI从根本上改变。 对此，来自加州理工、斯坦福和威大的研究人员提出了LeanAgent——一个终身学习，并能证明定理的AI智能体。

A mathematical theorem stating that a PERIODIC function f(x) which is reasonably continuous may be expressed as the sum of a series of sine or cosine terms (called the Fourier series), each of which ...

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When calculating angles using a circle theorem, always state which theorem applies. It may not be possible to calculate the missing angle immediately. It may be necessary to calculate another ...

Read, James 2024. The World in the Wave Function: A Metaphysics for Quantum Physics, by Alyssa Ney. Mind, Vol. 133, Issue. 530, p. 560.

82、贝叶斯定理（Bayes' Theorem） 贝叶斯定理描述了条件概率的关系，是贝叶斯统计的基础。 83、信息增益（Information Gain） 信息增益是用于特征选择的 ...