This is an old revision of this page, as edited by JohnAspinall (talk | contribs) at 19:59, 17 December 2010. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
This should be merged with [Disjunctive_sum].JohnAspinall (talk) 19:59, 17 December 2010 (UTC)[reply]