39622
He also studied and proved some theorems on perfect powers , such as the Goldbach–Euler theorem , and made several notable contributions to analysis .
 person: Goldbach–Euler
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: Goldbach–Euler 
Answer:
 person: Goldbach–Euler