1254
The theory of Gelfand pairs is closely related to the topic of spherical functions in the classical theory of special functions , and to the theory of Riemannian symmetric spaces in differential geometry .
 person: Gelfand; person: Riemannian
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: Gelfand; person: Riemannian