CTK Insights. I find the opening paragraph in a recent article by Marcus du Sautoy (The Mathematical Gazette 97 November 2013 No. 540, 386-397) revealing: During my year as President of The Mathematical Association the government began a review of the curriculum across all subjects taught in school.
Given the constant tinkering with the education system by every government, this is probably a sentence that any MA president could write during their tenure. The same of course holds for every president of the United States and all relevant organizations (NCTM, NEA, MAA, etc.) National Geographic. Discovery Channel : Science, History, Space, Tech, Sharks, News. Matrix 67. 随着常数 m 和 n 的变化，参数方程 x = sin(m · t), y = sin(n · t) 将会画出一系列漂亮的曲线。
法国物理学家 Jules Antoine Lissajous 曾在 1857 年研究过这类曲线，因此人们把它叫做 Lissajous 曲线。 我在 reddit 上看到了一个 Lissajous 曲线的动画演示，觉得看起来确实非常爽；但那个动画里没有解释曲线的生成方法，很多细节也有让人不太满意的地方，于是决定自己制作一个。 这个动画展示的是 m = 13, n = 18 时的 Lissajous 曲线。 2016 年 7 月 30 日至 8 月 7 日，第 39 届欧洲杂耍大会（European Juggling Convention）在荷兰的阿尔梅勒举行， 8 月 3 日凌晨的搏击之夜（Fight Night）自然再度成为了众人关注的焦点——它是杂耍斗（combat juggling）这项运动最大的赛事。 宇宙的心弦.