diffhistBinary relation15:57+8Senomo Drinestalkcontribs(Undid revision 1286817173 by TakuyaMurata (talk) Why would a reader implicitly assume repetition of the same pair does not happen? They are not a mathematician, we are talking about the average reader. Your analogy is also odd because the phrase "set of different people" works just fine, it just means a set of people with differing characteristics.)Tag: Reverted
diffhistBinary relation04:50−9TakuyaMuratatalkcontribs(different is also very weird; you don't say a set of different people. You just say a set of people (since we implicitly assume there is no repetition))
diffhistBinary relation03:01+48Senomo Drinestalkcontribs(Undid revision 1286726092 by D.Lazard (talk) It is still unclear whether or not it is referring to x and y as an "element" or as a "subset" of X and Y. An unknowing reader can interpret this as the cumulative set of x, y, rather than the set of differing pairs of x, y. Clarification is absolutely needed; ambiguity leads to wrongful conjecture.)Tags: UndoReverted