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About me
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月中和外导讨论的结束的时候,外导问,是否要回家一趟,我直接说不回去,因为回去到时候要重新办理签证会比较麻烦。外导是一个很nice的人,这周也和外导讨论一个topic之外的内容。
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最近科研一直不是很顺利,自己最近身体也出现一些小问题。目前正在调整当中,希望快点恢复。 这是最近的一些日常风景:
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考虑一个 $n \times n$ 满秩(可逆)矩阵 $A$, 如何求解 $\log A$ ?
一种方法是进行级数展开:
\(\log(A)= log(I+B)=\sum _{k=1}^{\infty }{(-1)^{k+1}{\frac {B^{k}}{k}}}=B-{\frac {B^{2}}{2}}+{\frac {B^{3}}{3}}-{\frac {B^{4}}{4}}+\cdots\)
另外一种方法是积分法(注意:使用该方法的条件是 的特征值不为负值): $\log A=\int^1_0(A-I)[t(A-I)+I]^{-1}dt.$
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This is my first blog to celebrate my first personal academic page.
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被这段话鼓励到了:
Short description of portfolio item number 1
Short description of portfolio item number 2
Published in Advances in Difference Equations, 2019
Published in Journal of Nonparametric Statistics, 2022
Published in Journal of Econometrics, 2024
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This is a description of your talk, which is a markdown files that can be all markdown-ified like any other post. Yay markdown!
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This is a description of your conference proceedings talk, note the different field in type. You can put anything in this field.
graduate course, Statistics, 2022
Workshop, Statistics, 2022