On Bohrs inequality
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 16 (2010) no. 4, pp. 312-313
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It is established that H. Bohr's inequality $\sum_{k=0}^\infty|f^{(k)}(0)/(2^{k/2}k!)|\le\sqrt2\|f\|_\infty$ is sharp on the class $H_\infty$.
Keywords:
sharp inequality for functions that are analytic in a circle.
@article{TIMM_2010_16_4_a29,
author = {V. A. Yudin},
title = {On {Bohrs} inequality},
journal = {Trudy Instituta matematiki i mehaniki},
pages = {312--313},
publisher = {mathdoc},
volume = {16},
number = {4},
year = {2010},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/TIMM_2010_16_4_a29/}
}
V. A. Yudin. On Bohrs inequality. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 16 (2010) no. 4, pp. 312-313. http://geodesic.mathdoc.fr/item/TIMM_2010_16_4_a29/