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 <div id="vector-matrix-and-array-expressions" class="section level2">
 <h2><span class="header-section-number">6.3</span> Vector, Matrix, and Array Expressions</h2>
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+This is an old version, <a href="https://mc-stan.org/docs/reference-manual/vector-matrix-array-expressions.html">view current version</a>.
 </div>
 <div id="vector-matrix-and-array-expressions" class="section level2">
 <h2 number="6.3"><span class="header-section-number">6.3</span> Vector, Matrix, and Array Expressions</h2>