Robuta

https://fs.unm.edu/nss8/index.php/111/article/view/3169 A contemporary postulates on resolvable sets and functions | Neutrosophic Sets and Systems sets and functions contemporary postulates systems https://books.google.com/books?id=qOQ-AAAAIAAJ Convex Cones, Sets, and Functions - Werner Fenchel - Google Books sets and functions convex cones werner fenchel