Abstract. We obtain the general form of a bijective order-preserving map defined on the poset of all $n\times n$ idempotent matrices over a field with at least 3 elements.
AMS Subject Classification
(1991): 06A11; 15A30
Received June 2, 2003, and in revised form July 14, 2003. (Registered under 2910/2009.)
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