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This led to tremendous advances in number theory , and the study of Diophantine equations ( " Diophantine geometry " ) and of Diophantine approximations remain important areas of mathematical research .
 Diophantine, Diophantine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Diophantine, Diophantine