52390
He is said to have been interested in the past in the Navier–Stokes equations and the problem of their existence and smoothness .
 person: Navier–Stokes
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: Navier–Stokes 
Answer:
 person: Navier–Stokes