Smoothness properties of generalized convex functions

R. A. Zalik
1976 Proceedings of the American Mathematical Society  
We present a concise and elementary proof of a theorem of Karlin and Studden concerning the smoothness properties of functions belonging to a generalized convexity cone.
doi:10.1090/s0002-9939-1976-0419700-9 fatcat:4m55v6ynojga5l33xmxxnncw7m