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He worked with Mary Cartwright on problems in differential equations arising out of early research on radar : their work foreshadowed the modern theory of dynamical systems .
 person: Mary Cartwright
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: Mary Cartwright