 -- logical or = vee, U+2228 ISOtech --&gt;
&lt;!ENTITY cap      CDATA "&amp;#8745;" -- intersection = cap, U+2229 ISOtech --&gt;
&lt;!ENTITY cup      CDATA "&amp;#8746;" -- union = cup, U+222A ISOtech --&gt;
&lt;!ENTITY int      CDATA "&amp;#8747;" -- integral, U+222B ISOtech --&gt;
&lt;!ENTITY there4   CDATA "&amp;#8756;" -- therefore, U+2234 ISOtech --&gt;
&lt;!ENTITY sim      CDATA "&amp;#8764;" -- tilde operator = varies with = similar to,
                                     U+223C ISOtech --&gt;
&lt;