• 10日下午3时,全国政协十三届二次会议第三次全体会议在人民大会堂举行。全国政协委员、民盟中央副主席、北京大学副校长田刚作了题为《教师是立教之本兴教之源》的大会发言。田刚表示,加强教师队伍应深化教师队伍管理...

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  • It's pancake day, so let's imagine a stack of pancakes. Unless you are very good at making them, the pancakes are likely to come in different sizes, which makes a stack of them look very untidy. One w...

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  • As Benjamin Franklin once joked, death and taxes are universal. Scale-free networks may not be, at least according to a new study from CU Boulder.

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  • Laws that require landlords to disclose bed bug infestations help combat the spread of the insects and protect the health of potential tenants. According to a new study, these laws also lead to cost s...

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  • 在薄壳的建模理论中,薄壳中面应力张量方程具有基础的重要性,例如,在薄壳分层理论中,当薄壳厚度趋于零时,薄壳非线性三维弹性能的Gamma极限(二维弹性能)就与薄壳中面的应力张量方程密切相关。此外,在薄壳的几何...

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  • 国际权威学术期刊《细胞—干细胞》(Cell Stem Cell)最近在线发表了由中国科学院数学与系统科学研究院和美国斯坦福大学科研人员合作的干细胞分化的基因调控网络建模成果,提出了利用匹配的基因表达和染色质可及性数...

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  • 据报道,当地时间2月25日,第十一届罗马尼亚数学大师杯赛结果公布。在团体排位中,中国队排名第六;在个人成绩排名中,中国选手的最高成绩是第15名。6名中国选手中,4人获得银牌,1人获得铜牌。...

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  • 围棋是我国传统“四艺”之一,文献所载可以追溯到春秋战国时期。如今,围棋已经变成国际通行的棋种。可是你知道吗,围棋不仅是我国的文化遗产,其中还隐藏着很多有趣的数学小知识。 (1)“千古无同局”中的数...

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  • 高质量的基因组是进化与遗传研究、精准医疗的基石。基因组拼接是以高通量测序技术为基础的核心计算生物学问题。中国科学院数学与系统科学研究院李雷研究团队将计算数学中的迭代、逐步逼近方法用于基因组拼接,研发了...

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  • Your brain is made up of billions of neurons connected by trillions of synapses. And how they're arranged gives rise to the brain's functionality and to your personality. That's why scientists in Swit...

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  • 有经验的建筑师在设计建筑物时都会遵循一个比例;画家在铺陈作画时也会遵循一个比例;服装设计师在寻求灵感的同时也会追求一个比例,这三个比例都是指——黄金分割比例。黄金分割,顾名思义,这个分割比例重要似黄金...

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  • In the last article we saw that light has a lot in common with matter. Despite this, we don't usually refer to light as "matter". In fact, as Faraday realized, light is related to the electromagnetic ...

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  • Having written down the equation in the last article, describing the standard model of particle physics (so capturing all the known interactions between all the known fundamental fields), we would now...

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  • How did you get into work today? I planned my journey on my phone with an app that uses traffic information and live data on the location of buses. On other days I might drive, navigating with my car'...

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  • 失踪的正方形

    2019-02-18

    将一张方格纸按图1所示画上正方形,然后沿图中所示的直线切割成5小块。当按照图2所示将这些正方形重新拼接成正方形时,中间竟然会出现一个空缺的小洞。被切割的图1是由49个正方形组成,但是拼接成的图2竟然只...

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