375327
In mathematics , the Castelnuovo – de Franchis theorem is a classical result on complex algebraic surface s. If X is such a surface , projective and non-singular , suppose given two differentials of the first kind on X which are linearly independent but with wedge product 0 .
 Castelnuovo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Castelnuovo