10541
Popular notations were ( x ) for universal and ( ∃ x ) for existential quantifiers , coming from Giuseppe Peano and William Ernest Johnson until the ∀ symbol was introduced by Gerhard Gentzen in 1935 and became canonical in the 1960 s .
 person: Giuseppe Peano; person: William Ernest Johnson; person: Gerhard Gentzen
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: Giuseppe Peano; person: William Ernest Johnson; person: Gerhard Gentzen