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Editorial Note

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.

Editors