One cannot escape the feeling that these mathematical formulas have an independent existence and an intelligence of their own, that they are wiser than we are, wiser even than their discoverers.
人们不禁会感到这些数学公式拥有独立的存在和自己的智慧,它们比我们更聪明,甚至比它们的发现者更聪明。
卖出股票的最佳时机几乎永远不会到来。
孔子说:“对品德不进行培养,对学问不进行钻研,听到好人好事不能跟着做,有了错误不能及时改正,这就是我所担忧的。”
系统辨识的挑战不仅在于拟合数据,还在于提取有意义且可推广的模型。