Definition:Differential of Mapping/Notation

Notation for Differential
There are various notations for the differential of a function $f$ at $x$:


 * $\mathrm d f \left({x}\right)$
 * $\mathrm d f_x$
 * $\mathrm d_x f$
 * $D f \left({x}\right)$
 * $D_x f$