Abstract
Let P be a finite ordered set, and let J( P) be the distributive lattice of order ideals of P. The covering relations of J( P) are naturally associated with elements of P; in this way, each element of P defines an involution on the set J( P). Let Γ( P) be the permutation group generated by these involutions. We show that if P is connected then Γ( P) is either the alternating or the symmetric group. We also address the computational complexity of determining which case occurs.
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