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[edit] "less than or equal" should be "less than"
I've just read the original 1983 paper, and noticed that the wikipedia definition is about finding the number of pairs separated by an amount "less than or equal to distance epsilon", whereas the 1983 definition just uses "less than" (i.e. equality doesn't count). It's a very minor point but I thought it worth noting just for future editors' reference. I'll change the article to reflect this. --mcld 21:33, 17 July 2007 (UTC)