Riordan group involutions |
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| Authors: | Gi-Sang Cheon Hana Kim |
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| Institution: | a Department of Mathematics, Sungkyunkwan University, Suwon 440-746, Republic of Korea
b Department of Mathematics, Howard University, Washington, DC 20059, USA |
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| Abstract: | We study involutions in the Riordan group, especially those with combinatorial meaning. We give a new determinantal criterion for a matrix to be a Riordan involution and examine several classes of examples. A complete characterization of involutions in the Appell subgroup is developed. In another direction we find several examples that generalize the RNA matrix but are of independent interest. |
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| Keywords: | Primary 05A30 Secondary 05A15 |
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