For example:\[\int _ { \mathcal { C } } \cdots d l \nonumber \text{ is an integral over the curve } \mathcal { C } \nonumber \]\[\int _ { \mathcal { S } } \cdots d s\nonumber \text{ is an integral ove...For example:\[\int _ { \mathcal { C } } \cdots d l \nonumber \text{ is an integral over the curve } \mathcal { C } \nonumber \]\[\int _ { \mathcal { S } } \cdots d s\nonumber \text{ is an integral over the surface } \mathcal { S } \nonumber \]\[\int _ { \mathcal {V } } \cdots d s\nonumber \text{ is an integral over the volume } \mathcal { V }. \nonumber \]
