Bulletin of the London Mathematical Society Advance Access originally published online on August 13, 2008
Bulletin of the London Mathematical Society 2008 40(6):956-964; doi:10.1112/blms/bdn076
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© 2008 London Mathematical Society
An inequality for the modulus of a polynomial evaluated at the roots of unity
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Received 31 October 2007. Revision received 29 May 2008.
It is shown that if P(z) is an analytic polynomial of degree n and if N is a natural number with N>n, then
, where
runs through the Nth roots of unity.
2000 Mathematics Subject Classification 30C10, 42A15.