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In his work " Arithmetica " , the Greek mathematician Diophantus solved the quadratic equation , but giving only one root , even when both roots were positive .
 person: Diophantus
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Diophantus 
Answer:
 person: Diophantus