are you trying to make internal links to a different part of the document?
idk what function name="" has but according to
this its not a supported function of 'a'
Taking a guess at what your asking, if you want 4 to link to 45,
then 4 needs a url that points to the 45 id, like
<p class="calibre2"><sup class="calibre3" id="v15004045">45</sup></p>
<p class="calibre2"><a href="part0000.html#v15004045">4</a></p>
just swap part0000.html with whatever file 45 is located in with your doc