Talk:Restricted sumset

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nonempty

The first paragraph defines:

A_{1},\ldots ,A_{n}

are finite nonempty subsets

.. but later it is noted that |S| = 0 is possible. Is anything actually gained by disallowing empty A_i? Should the 'nonempty' restriction actually be there? Hv 23:28, 10 August 2007 (UTC)[reply]