On~quasianalytic noncontinuability of a~function given by a~series of exponentials
Izvestiya. Mathematics , Tome 30 (1988) no. 2, pp. 245-261.

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The author showed (RZh. Mat., 1973, 2B135) that if $0\lambda_k\uparrow\infty$, $\sum_1^\infty\lambda_k^{-1}\infty$, and the index of condensation of the sequence $\{\lambda_k\}$ is equal to zero, then the function $f(z)=\sum_1^\infty a_k e^{\lambda_kz}$ cannot be continued quasianalytically across the line of convergence of the series. Results have now been obtained on noncontinuability under a stronger restriction on $\{\lambda_k\}$: $\lim\frac k{\lambda_k^\rho}\infty$, $0\rho1$. Bibliography: 9 titles.
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A. F. Leont'ev. On~quasianalytic noncontinuability of a~function given by a~series of exponentials. Izvestiya. Mathematics , Tome 30 (1988) no. 2, pp. 245-261. http://geodesic.mathdoc.fr/item/IM2_1988_30_2_a2/

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