10492
Some of " mainstream mathematics " ( mathematics not directly connected with axiomatic set theory ) is beyond Peano arithmetic and second-order arithmetic , but still , all such mathematics can be carried out in ZC ( Zermelo set theory with choice ) , another theory weaker than ZFC .
 person: Peano; person: Zermelo
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; person: Zermelo