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<tr><td align="left" valign="top"><a href="maxima_61.html#SEC219">61. orthopoly</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">                   Polinómios ortogonais.
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<tr><td align="left" valign="top"><a href="maxima_62.html#SEC228">62. plotdf</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">                      Gráficos de campos de direcções.
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<tr><td align="left" valign="top"><a href="maxima_63.html#SEC231">63. romberg</a></td><td>&nbsp;&nbsp;</td><td a