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 ...

Sir George Cayley, who represented Scarborough in the House of Commons, developed the world's first manned, fixed-wing glider ...

This faithful recreation of Sir George Cayley's pioneering glider, "The Governable Parachute", was built for an Anglia television documentary which aimed to prove that Cayley's original could ...

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With only two months to go until the most wonderful time of the year, Christmas preparations are in full swing across Wales.