Geodesic
The quasi-spectrum of divided powers
Fundamentalʹnaâ i prikladnaâ matematika, Tome 14 (2008) no. 4, pp. 213-226.

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The paper investigates the structure of the quasi-spectrum of divided powers and its behavior under the Taylor homomorphism. General as well as stronger particular results are obtained. In particular, the answer for the Hurwitz series is stated. 
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D. V. Trushin. The quasi-spectrum of divided powers. Fundamentalʹnaâ i prikladnaâ matematika, Tome 14 (2008) no. 4, pp. 213-226. http://geodesic.mathdoc.fr/item/FPM_2008_14_4_a13/

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