This note concerns the paper: Mohammad Mujalli Al-Mahameed, Weak Discrete Maximum Principles, Arch. Math. (Brno) 41, 2 (2005), 167--173.
This paper was discovered after the publication to have been plagiarized from the earlier work: K. Ishihara, Strong and weak discrete maximum principles for matrices associated with elliptic problems, Linear Algebra Appl. 88/89 (1987), 431--448.
We very much regret this error.