32866
More generally , the spaces of non-Euclidean geometries can be realized as Riemannian manifolds .
 non-Euclidean, Riemannian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 non-Euclidean, Riemannian