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Terseness: Minimal idempotent generating sets for K(n,r)
Authors:Robert B McFadden  Steve Seif
Institution:1. Department of Mathematics, University of Louisville, 40292, Louisville, KY, USA
Abstract:Let n and r be positive integers with 1 < r < n and let K(n,r) consist of all transformations on X n = {1,...,n} having image size less than or equal to r. For 1 < r < n, there exist rank-r elements of K(n,r) which are not the product of two rank-r idempotents. With this limitation in mind, we prove that for fixed r, and for all n large enough relative to r, that there exists a minimal idempotent generating set U of K(n,r) such that all rank-r elements of K(n,r) are contained in U 3. Moreover, for all n > r > 1, there exists a minimal idempotent generating set W for K(n,r) such that not every rank-r element is contained in W 3.
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