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- W2949410110 abstract "Let G be a group and let A be the algebra of complex functions on G with finite support. The product in G gives rise to a coproduct on A making it a multiplier Hopf algebra. In fact, because there exist integrals, we get an algebraic quantum group. Now let H be a finite subgroup of G and consider the subalgebra of functions in A that are constant on double cosets of H. The coproduct in general will not leave this algebra invariant but we can modify it so that it will leave the subalgebra invariant (in the sense that the image is in the multiplier algebra of the tensor product of this subalgebra with itself). However, the modified coproduct on the subalgebra will no longer be an algebra map. So, in general we do not have an algebraic quantum group but a so-called algebraic quantum hypergroup. Group-like projections in a *-algebraic quantum group A give rise, in a natural way, to *-algebraic quantum hypergroups, very much like subgroups do as above for a *-algebraic quantum group associated to a group. In this paper we push this result further. On the one hand, we no longer assume the *-structure while on the other hand, we allow the group-like projection to belong to the multiplier algebra M(A) of A and not only to A itself. Doing so, we not only get some well-known earlier examples of algebraic quantum hypergroups but also some interesting new ones." @default.
- W2949410110 created "2019-06-27" @default.
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- W2949410110 date "2010-02-19" @default.
- W2949410110 modified "2023-09-27" @default.
- W2949410110 title "Algebraic quantum groups II. Constructions and examples" @default.
- W2949410110 hasPublicationYear "2010" @default.
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