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Mathematica

The Mathematica Book

Mathematica Reference Guide

Listing of Named Characters

Sqrt

\[Sqrt]

Alias: sqrt.

Prefix operator with built-in evaluation rules.

x is by default interpreted as Sqrt[x].

@, 2 or \@ yields a complete SqrtBox object.

\[Sqrt] is equivalent when evaluated, but will not draw a line on top of the quantity whose square root is being taken.

See The Mathematica Book: Section 3.10.4.