Explain the challenge of author disambiguation due to homonyms and synonyms. Focus on academic publications in Mathematics. Show the sort of data possible to obtain from Wikidata. This includes getting external links to other sources. Demonstrate the available sources that can all be linked in order to enrich author profiles and help with disambiguation. Explain the problems with the data: mistakes, corrections, changes and the having to backlink all other sources that you received from Wikidata. Show the techniques used for getting matches with examples of how much information one can get out of a single match regarding meta data and other external links.