We consider presentation of a multiple Riordan array in the form of [Formula: see text] tuple ‘single’ Riordan arrays, which was recently proposed by Petrullo. We give an explicit formula for an isomorphism between the [Formula: see text]-tuple Riordan group [Formula: see text] and the subgroup of [Formula: see text].
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Roksana Slowik (2026) studied this question.
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