跑得比什麼都快
Positive-definite matrix - Wikipedia, the free encyclopedia(有的地方用台語發音比較好笑) 有一個旅客到蒙古旅行,遇到一位商人, 商人就對他說:我有一隻馬,跑得比什麼都快,旅客不信,於是商人就說不信你試試看! 旅客一上馬,不論怎麼踢它、打它這隻馬都不動,他就去問商人, 商人就說你忘了說"X你娘"(台)這三個字,旅客得知In linear algebra, a symmetric n × n real matrix M is said to be positive definite if z T Mz is positive for every non-zero column vector z of n real numbers. Here z T denotes the transpose of z. More generally, an n × n ......
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