Group-Like algebras and Hadamard matrices

Details Group-Like algebras and Hadamard matrices Group-Like algebras and Hadamard matrices

2006-02-10

arxiv.org/abs/math/0602224v1

Mathematics

Quantum Algebra

Scientific paper

We give a description in terms of square matrices of the family of group-like algebras with $S*id=id*S=u\epsilon$. In the case that $S=id$ and $char\Bbbk$ is not 2 and does not divide the dimension of the algebra, this translation take us to Hadamard matrices and, particularly, to examples of biFrobenius algebras satisfying $S*id=id*S=u\epsilon$ and that are not Hopf algebras. Finally, we generalize some known results on separability and coseparability valid for finite dimensional Hopf algebras to this special class of biFrobenius algebras with $S*id=id*S=u\epsilon$, presenting a version of Maschke's theorem for this family.

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