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<h2><a name="AlffCanonicalDivisor"></a>
AlffCanonicalDivisor
</h2>

Computes a canonical divisor of an algebraic function field
F/k.

<p><p>

<h3>
Syntax:
</h3>
<pre>W := AlffCanonicalDivisor(F);</pre>

<p>

<table>
<tr>
<td>alff divisor</td>
<td><pre>  W  </pre></td>
<td></td>
</tr>
<tr>
<td>algebraic function field</td>
<td><pre>  F  </pre></td>
<td></td>
</tr>
</table>

<p>


See also:&nbsp;&nbsp;<a href="kashref.html#AlffDifferentDeg">AlffDifferentDeg</a>, <a href="kashref.html#AlffDifferent">AlffDifferent</a>, <a href="kashref.html#AlffDiffDivisor">AlffDiffDivisor</a>, <a href="kashref.html#AlffDivisorLDim">AlffDivisorLDim</a>, <a href="kashref.html#AlffGenus">AlffGenus</a>, <a href="kashref.html#AlffInit">AlffInit</a>, <a href="kashref.html#AlffOrders">AlffOrders</a>

<p>

<h3>
Description:
</h3>
Let F/k be an algebraic function field and omega be
a differential of F/k. The divisor W = (omega) of
the differential omega is called a canonical divisor of F/k.
For W holds deg W = 2 g -2 and dim W = g, where
g is the genus of F/k.

<p><p>

<p>
<hr>
<p>
<h3>
Example:
</h3>

<pre>

</pre>

<p>


<hr>

<p>
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