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The article describes only a special case. There are also several Weierstraß inequalities which are formulated for the general case, see Mitrinovic, Analytic Inequalities, Springer, or Bromwich Introduction to the theory of infinite series, 1908, p. 95, de:Ungleichungen von Weierstraß.-- Claude J ( talk) 08:19, 19 June 2018 (UTC) reply