55071
Then , if regularity conditions are satisfied , where ƒ * is the convex conjugate of ƒ ( also referred to as the Fenchel – Legendre transform ) and g * is the concave conjugate of g. That is , Mathematical theorem Let X and Y be Banach spaces , f : X \ to \ mathbb \ cup \ and g : Y \ to \ mathbb \ cup \ be convex functions and A : X \ to Y be a bounded linear map .
 Fenchel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Fenchel