2 papers
math.CO2026
On Smithson's fixed point theorem for order preserving multifunctions
Haruki Kono, Mark Voorneveld
Fixed point theorems are ubiquitous in economic research. Many studies cite Smithson (1971) ``Fixed points of order preserving multifunctions,'' yet the original proof contains err…
cs.GT2025
Von Neumann's minimax theorem through Fourier-Motzkin elimination
Mark Voorneveld
Fourier-Motzkin elimination, a standard method for solving systems of linear inequalities, leads to an elementary, short, and self-contained proof of von Neumann's minimax theorem.