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In mathematics , Fenchel 's duality theorem is a result in the theory of convex functions named after Werner Fenchel .
 Fenchel, Werner Fenchel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Fenchel, Werner Fenchel