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It is also an isomorphism of Riemann surfaces from the torus to the cubic curve , so topologically , an elliptic curve is a torus .
 person: Riemann
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: Riemann 
Answer:
 person: Riemann