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Published online by Cambridge University Press: 24 October 2008
Any one who has dealt with the convergence of multiple series soon becomes aware that simple and interesting examples are very scarce. It may therefore be worth while placing on record the following result which is not altogether trivial.
* Prof Littlewood, to whom I mentioned the series, sent me a neater solution obtained by splitting S 3 say, into partial series whose limits of summation are of the type l≥m≥n etc.