16.8.4 \sqrt

Synopsis, one of:


The square root, or optionally other roots, of arg. The optional argument root-number gives the root, i.e., enter the cube root of x+y as \sqrt[3]{x+y}. The size of the radical grows with that of arg (as the height of the radical grows, the angle on the leftmost part gets steeper, until for a tall enough arg, it is vertical).

LaTeX has a separate \surd symbol for making a square root without arg (see Math symbols).

Unofficial LaTeX2e reference manual