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In mathematical analysis , the rising sun lemma is a lemma due to Frigyes Riesz , used in the proof of the Hardy – Littlewood maximal theorem .
 Frigyes Riesz
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Frigyes Riesz