gap&gt; ps := HermitianPolarSpace(4,64);
H(4, 8^2)
gap&gt; phi := PolarityOfProjectiveSpace(ps);
&lt;polarity of PG(4, GF(2^6)) &gt;
gap&gt; ps := ParabolicQuadric(6,8);
Q(6, 8)
gap&gt; PolarityOfProjectiveSpace(ps);
Error, no polarity of the ambient projective space can be associated to &lt;ps&gt; called from
&lt;function "unknown"&gt;( &lt;arguments&gt; )
 called from read-eval loop at line 11 of *stdin*
you can 'quit;' to quit to outer loop, or
you can 'return;' to continue
brk&gt; quit;
