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However , the discovery of paradoxes in naive set theory , such as Russell 's paradox , led to the desire for a more rigorous form of set theory that was free of these paradoxes .
 person: Russell
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Russell