2 papers
math.CO2026
Coin Turning Games on Partially Ordered Sets
Masao Ishikawa, Toyokazu Ohmoto, Hiroyuki Tagawa +1
A finite impartial game is a two-player game in which the players take turns making moves and the game ends after finitely many moves. In this paper, we study a class of finite imp…
math.CO2024
The characterization of an Alternating Sign Matrix using a triplet
Toyokazu Ohmoto
Alternating Sign Matrix(ASM for short) is a square matrix which is consist of 0, 1 and -1. In this paper, we characterize an ASM by showing a bijection between alternating sign mat…