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Hardy martingales and Jensen's Inequality

N. Asmar, Stephen J. Montgomery-Smith

math.FAarXiv:math/9503213

Abstract

We extend ideas of Garling to consider the so called Hardy martingales in a more general setting of Hp theory of compact abelian groups with ordered dual. As a consequence, we obtain a new proof of a result of Helson and Lowdenslager which generalizes Jensen's Inequality for H1 functions.

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