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However , the interpretation of mathematical knowledge has changed from ancient times to the modern , and consequently the terms " axiom " and " postulate " hold a slightly different meaning for the present day mathematician , than they did for Aristotle and Euclid .
 Aristotle, Euclid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Aristotle, Euclid