作者: J. M. Sepulcre , T. Vidal , M. Righetti
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摘要: Given two arbitrary almost periodic functions, we prove that the existence of a common open vertical strip $V$, where both functions assume same set values on every substrip included in is necessary and sufficient condition for to have region periodicity be $^*$-equivalent. This represents an improvement previous results it settles problem Bohr's equivalence theorem not having converse.