1686
William Burnside used such triangles , projecting from a point on the hyperbola " xy " = 1 onto the main diagonal , in his article " Note on the addition theorem for hyperbolic functions " .
 person: William Burnside
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: William Burnside 
Answer:
 person: William Burnside