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16.7.5 \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 radical grows with the size of arg (as the height of the radical grows, the angle on the leftmost part gets steeper, until for a large enough arg, it is vertical).

LaTeX has a separate \surd character (see Math symbols).

Unofficial LaTeX2e reference manual