© 2001 by London Mathematical Society
© The London Mathematical Society
Logarithmic Growth for Matrix Martingale Transforms
Department of Mathematics and Statistics, University of Edinburgh Edinburgh EH9 3JZ
Department of Mathematics, Michigan State University East Lansing, MI 48824, USA
Received 3 July 2000. Revision received 5 April 2001.
An example is given of an operator weight W that satisfies the dyadic operator HuntMuckenhouptWheeden condition
for which there exists a dyadic martingale transform on L2 (W) that is unbounded. The construction relates weighted boundedness to the boundedness of dyadic vector Hankel operators.