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International Journal of Mathematics and Mathematical Sciences
Volume 28 (2001), Issue 4, Pages 189-200

Matrix transformations of starshaped sequences

Penn State University, Shenango Campus, 147, Shenango Avenue, Sharon 16146, PA, USA

Received 1 March 2001

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We deal with matrix transformations preserving the starshape of sequences. The main result gives the necessary and sufficient conditions for a lower triangular matrix A to preserve the starshape of sequences. Also, we discuss the nature of the mappings of starshaped sequences by some classical matrices.