Hamada, Sayaka(Editorial Universitat Politècnica de València, 2015-04-01)
[EN] The aim of this paper is to prove a known fact that the digital line is cotractible. Hence we have that the digital space $({\bf Z}^{n}, \kappa^{n})$ is also cotractible where $({\bf Z}^{n}, \kappa^{n})$ is $n$ products ...