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0 Some basic properties Fortran code is case insensitive Fortran code must be written in a program, similar to the main() function in C Example 1 Hello World 1 2 3 program hello_world print *,'Hello World' end program hello_world ...

From dimensional analysis, volume of a n-ball is proportional to $R^n$ $$ V_n=C_n R^n $$Then from $\int_0^R S_n dr=V_n$ $$ \frac{dV_n}{dR}=V_n=n C_n R^{n-1} $$...

之前一直是vim原教旨主义者，只用官方的vim，但是vim9推出之后看到网上的评价是重新做了一份插件语言，而neovim可以兼容vim还可以用lua配置，其次neovim内置lsp，想起之前配置语言自动补全的失败经历，尝试了下neovim的配置，果然方便太多了。 下面记录配置python lsp的过程。 ...

$$ \operatorname{Tr}(A+B) \equiv \operatorname{Tr}(A)+\operatorname{Tr}(B) $$$$ \operatorname{Tr}(A B \ldots Y Z) \equiv \operatorname{Tr}(Z A B \ldots Y) $$$$ \gamma^{\mu} \gamma^{\nu}+\gamma^{\nu} \gamma^{\mu} \equiv 2 g^{\mu \nu} I $$...