Ponstein, J. (1967) Seven Kinds of Convexity. SIAM Review, 9, 115-119.
https://doi.org/10.1137/1009007

has been cited by the following article:

• TITLE: Convexity Properties for a Function of Two Integer Variables

  AUTHORS: Sara Nourazari, Hillel Kumin

  KEYWORDS: Linear Integer Programming, Convexity

  JOURNAL NAME: American Journal of Operations Research, Vol.11 No.6, October 13, 2021

  ABSTRACT: Sufficient conditions are given for any local minimum of a function of two integer variables to be a global minimum. An example is given to show that a function of two integer variables need not be discrete convex for this condition to hold.