<primary>gamma</primary>
        </indexterm>
        <function>gamma</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Gamma function
       </para>
       <para>
        <literal>gamma(0.5)</literal>
        <returnvalue>1.772453850905516</returnvalue>
       </para>
       <para>
        <literal>gamma(6)</literal>
        <returnvalue>120</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>gcd</primary>
        </indexterm>
        <function>gcd</function> ( <replaceable>numeric_type</replaceable>, <replaceable>numeric_type</replaceable> )
        <returnvalue><replaceable>numeric_type</replaceable></returnvalue>
       </para>
       <para>
        Greatest common divisor (the largest positive number that divides both
        inputs with no remainder); returns <literal>0</literal> if both inputs
        are zero; available for <type>integer</type>, <type>bigint</type>,
        and <type>numeric</type>
       </para>
       <para>
        <literal>gcd(1071, 462)</literal>
        <returnvalue>21</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>lcm</primary>
        </indexterm>
        <function>lcm</function> ( <replaceable>numeric_type</replaceable>, <replaceable>numeric_type</replaceable> )
        <returnvalue><replaceable>numeric_type</replaceable></returnvalue>
       </para>
       <para>
        Least common multiple (the smallest strictly positive number that is
        an integral multiple of both inputs); returns <literal>0</literal> if
        either input is zero; available for <type>integer</type>,
        <type>bigint</type>, and <type>numeric</type>
       </para>
       <para>
        <literal>lcm(1071, 462)</literal>
        <returnvalue>23562</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>lgamma</primary>
        </indexterm>
        <function>lgamma</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Natural logarithm of the absolute value of the gamma function
       </para>
       <para>
        <literal>lgamma(1000)</literal>
        <returnvalue>5905.220423209181</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>ln</primary>
        </indexterm>
        <function>ln</function> ( <type>numeric</type> )
        <returnvalue>numeric</returnvalue>
       </para>
       <para role="func_signature">
        <function>ln</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Natural logarithm
       </para>
       <para>
        <literal>ln(2.0)</literal>
        <returnvalue>0.6931471805599453</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>log</primary>
        </indexterm>
        <function>log</function> ( <type>numeric</type> )
        <returnvalue>numeric</returnvalue>
       </para>
       <para role="func_signature">
        <function>log</function> ( <type>double precision</type> )
        <returnvalue>double precision</returnvalue>
       </para>
       <para>
        Base 10 logarithm
       </para>
       <para>
        <literal>log(100)</literal>
        <returnvalue>2</returnvalue>
       </para></entry>
      </row>

      <row>
       <entry role="func_table_entry"><para role="func_signature">
        <indexterm>
         <primary>log10</primary>
        </indexterm>