The \sqrt command produces the square root (radical) symbol with the argument as radicand. The optional argument, root, determines what root to produce, i.e. the cube root of x+y would be typed as $\sqrt[3]{x+y}$.

The radical sign is variable size, that is, it is made larger if the radicand is, for example, a built-up fraction.

See also: Math Formulas, Math Miscellany.
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Sheldon Green, agxsg@giss.nasa.gov, 31 May 1995.