10490
Many mathematical theorems can be proven in much weaker systems than ZFC , such as Peano arithmetic and second-order arithmetic ( as explored by the program of reverse mathematics ) .
 person: Peano
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Peano