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<p>(this is true in the sense of <a href="page.php?w=formal_power_series">formal power series</a>, even if the sum has a zero <a href="page.php?w=radius_of_convergence">radius of convergence</a>).</p>

<p><big>Closure properties</big></p>
<p>Holonomic functions (or sequences) satisfy several <a href="page.php?w=closure_property">closure properties</a>. In particular, holonomic functions (or sequences) form a <a href="page.php?w=ring_%28mathematics%29">ring</a>. They are not closed under division, however, and therefore do not form a <a href="page.php?w=field_%28mathematics%29">field</a>.</p><p>
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