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The Lefschetz fixed-point theorem applies to ( almost ) arbitrary compact topological spaces , and gives a condition in terms of singular homology that guarantees the existence of fixed points ; this condition is trivially satisfied for any map in the case of " D " .
 Lefschetz
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lefschetz