anna42
anna42

One day in class, Richard Feynman was talking about angular momentum. He described rotation matrices and mentioned that they did not commute. He said that Sir William Hamilton discovered noncommutivity one night when he was taking a walk in his garden with Lady Hamilton. As they sat down on a bench, there was a moment of passion. It was then that he discovered that AB did not equal BA.(都这么着讲课...会把纯良的孩子们教坏的老师!!!

anna42
焦糖奶油菇有一天,在课堂上,费曼在谈论角动量.他描述旋转矩阵,并提到,他们不能交换(没有交换律).他说,是威廉汉密尔顿发现了不可交换性,一天晚上,他在他的花园里与汉密尔顿夫人散步.当他们坐下的长凳上,缠绵了一小会.正是在这时,他发现,AB不等于BA.- -2011-01-08 12:09:20
maodou
momo不明白怎么得到的AB不等于BA。。。2011-01-08 13:34:10
anna42
焦糖奶油菇momo毛豆注意看原文"a moment of passion",( ̄y▽ ̄)╭sex的问题2011-01-08 13:52:19
ka_ka_cat
ka_ka_catmomoA、B是矩阵啦。别把咱毛豆童鞋纯洁的心灵污染了2011-01-08 15:10:20