積分 (Integral)

$$ \int f(x)dx, \ g(x)=\int^{x} f(x')dx', \ \int_{\alpha}^{\beta} f(x)dx. $$

面積分 (surface integral)

$$ \int\mspace{-11mu}\int_{S} f(x,y)\mspace{2mu}{\rm d}x \mspace{2mu}{\rm d}y $$

線積分 (line integral)

$$ \quad \oint_{C} f(z){\rm d}z $$

REFERENCES:

  • http://hooktail.sub.jp/nocategory/latexImpress/