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旧：\newcommand\rmd[1]{\mathop{\mathrm{d}#1}}
新：\newcommand\rmd{\mathop{}\!\mathrm{d}}
\(\newcommand\oldrmd[1]{\mathop{\mathrm{d}#1}}\)
\(\newcommand\newrmd{\mathop{}\!\mathrm{d}}\)
$1+\oldrmd{x^2}+1$ wrong
${1+\oldrmd{x^2}}+1$ right
$1+\newrmd x^2+1$
$\int f(x)\oldrmd x$
$\int f(x)\newrmd x$
$\displaystyle
\frac{\oldrmd x}{\oldrmd y}+\frac{\oldrmd{^2x}}{\oldrmd{y^2}}$
$\displaystyle
\frac{\newrmd x}{\newrmd y}+\frac{\newrmd^2x}{\newrmd y^2}$ |
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