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This is an old version, <a href="https://mc-stan.org/docs/reference-manual/licenses.html#eigen-license">view current version</a>.
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<h2><span class="header-section-number">22.3</span> Eigen license</h2>
<p>Stan uses the Eigen library for matrix arithmetic and linear algebra.
Eigen is distributed under the</p>
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<li><a href="http://opensource.org/licenses