# \sqrt from another font

I'm trying to change a specific char in my math collection: the square root symbol, as you can see below:

I'm trying to do it via \DeclareMathSymbol{\sqrt}... , but I can't determine witch parameters I have to enter.

The square root symbol that I want is available using the utopia option with the mathdesign package.

Any ideas?

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You have to define new symbol fonts; the relevant declarations are

\DeclareSymbolFont{mdputsymbols}{OMS}{mdput}{m}{n}
\DeclareSymbolFont{mdputlargesymbols}{OMX}{mdput}{m}{n}

Here's an example; the two \let instructions are to keep the old symbol for doing a comparison. In the output, the new one (Utopia based) is on the left.

\documentclass{article}
\let\oldsqrtsign\sqrtsign
\DeclareSymbolFont{mdputsymbols}{OMS}{mdput}{m}{n}
\DeclareSymbolFont{mdputlargesymbols}{normal}{OMX}{mdput}{m}{n}
$\sqrt{abc}$
{\let\sqrtsign\oldsqrtsign$\sqrt{abc}$}