$$ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % Self-defined math definitions %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % Math symbol commands \newcommand{\intd}{\,{\rm d}} % Symbol 'd' used in integration, such as 'dx' \newcommand{\diff}{{\rm d}} % Symbol 'd' used in differentiation ... $$
2021年2月23日
Riemann可积
摘要： 引入迪利克雷函数 \[ \mathcal D(x)=\left\{\begin{array}{l} 1,当x\in \mathbb Q\\ 0,当x\in\mathbb R\setminus\mathbb Q \end{array}\right. \] 在闭区间$[0,1]\(上不可积，因为对区间\ 阅读全文
posted @ 2021-02-23 10:31 茶水不太凉丶 阅读(461) 评论(0) 推荐(0)
第一个随笔
摘要： \[ 1+1=2 \] 阅读全文
posted @ 2021-02-23 10:09 茶水不太凉丶 阅读(15) 评论(0) 推荐(0)