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Radford's S^4 formula for co-Frobenius Hopf algebras

Margaret Beattie·Daniel Bulacu·Blas Torrecillas
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Abstract

This note extends Radford's formula for the fourth power of the antipode of a finite dimensional Hopf algebra to co-Frobenius Hopf algebras and studies equivalent conditions to a Hopf algebra being involutory for finite dimensional and co-Frobenius Hopf algebras.

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Margaret Beattie, Daniel Bulacu, Blas Torrecillas. 2006-06-02. Radford's S^4 formula for co-Frobenius Hopf algebras. https://arxiv.org/abs/math/0511535

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