Motivated by international energy trade between countries with profit-maximizing domestic producers, we analyze Nash games played among Stackelberg games leaders (NASP). We prove it is both $$\Sigma^p_2$$-hard to decide if the game has a pure-…

ZERO is a multi-purpose C++ solver for Mathematical Programming Games. Currently, it manages NASPs (EPECs) and Integer Programming Games. It offers a series of modular components to help users to express and solve mathematical programming games…

In conferences held at the Oberwolfach Institute, participants usually dine together in a room witg tables of different sizes, and each participant has an assigned seat. Gerhard Ringel asked whether there exists a seating arrangement for an od…