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His work on sheaf theory hardly appears in his published papers , but correspondence with Henri Cartan in the late 1940 s , and reprinted in his collected papers , proved most influential .
 person: Henri Cartan
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: Henri Cartan