我的数学人生

张益唐的数学人生离普通人好遥远,俺来聊自己的数学人生

 

矢量,矩阵,张量的各种微分偏微分梯度等是基本看家活,还要熟记一些等式不等式。

 

工程里无非正问题或逆问题,正问题以前多仰仗有限元,有限体元,差分法等,现在有好多spectral/meshless的方法,逆问题多依赖各种优化,连续变量的无非凸或非凸优化,离散变量用到submodular等,特殊情况可以用马尔可夫场的方法,另外,逆问题会和正问题交织,并且需要适定化来稳定唯一解,其中稀疏性是一个常用合理假设,另一个是平滑性。

 

建立问题的数学模型除了科学原理外,往往要熟悉变分法,因为很多科学原理可以用变分形式加以描述。

 

统计方法必不可少,参数非参数推断的,特别是贝叶斯理论用的很多。

和统计关联的是不确定性的定量化,各个领域都要用。随机微分方程要熟。

先到这。

 

 

 

 

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