The solvable Lie group $N_{6,28}$: an example of an almost $C_0(\mathcal{K})$-C*-algebra

Motivated by the description of the C*-algebra of the affine automorphism group $N_{6,28}$ of the Siegel upper half-plane of degree 2 as an algebra of operator fields defined over the unitary dual $\widehat{N_{6,28}}$ of the group, we introduce a family of C*-algebras, which we call almost $C_0(\mathcal{K})$, and we show that the C*-algebra of the group $N_{6,28}$ belongs to this class.

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