4: Functions from Rⁿ' to Rⁿ
( \newcommand{\kernel}{\mathrm{null}\,}\)
Thumbnail: Double integral as volume under a surface z=10−x2−y2/8. The rectangular region at the bottom of the body is the domain of integration, while the surface is the graph of the two-variable function to be integrated. (Public Domain; Oleg Alexandrov).