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Published online by Cambridge University Press: 18 May 2009
Let G be a compact abelian group and let Γ be its (discrete) dual group. Denote by M(G) the space of complex regular Borel measures on G.
Let E be a subset of Γ. Then:
(i) E is called a Rajchman set if, for all μ ∈M(G) implies
(ii) E is called a set of continuity if given ε > 0 there exists δ > 0 such that if and
(iii) E is called a parallelepiped of dimension N if |E| = 2N and there are two-element sets . (The multiplication indicated here is the group operation.)