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Discreet math question

  1. Sep 21, 2004 #1
    I didn't really know where to put this so, I put it here. Anyway in discreet mathematics what does the term max{x,y} mean? I can't find it in the book anywhere and the problem I'm trying to do says:

    max{x,y} = (x+y+|x-y|)/2 for all real x,y

    Note: I'm not asking you to do the problem I just want to know what max means.
  2. jcsd
  3. Sep 21, 2004 #2


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    If S is a set, then max S is simply the maximum element of S.

    More precisely, max S = x iff:
    x is in S
    for all y in S: y <= x.

    Note that max S is not always defined if S is an infinite set.
  4. Sep 21, 2004 #3
    Thanks I appreciate it.
  5. Sep 21, 2004 #4


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    The word for the mathematics you are talking about is spelled "discrete". The word "discreet" has to do with social behavior. For example if someone is dressed like a slob, it is discreet not to mention it in public.
  6. Sep 22, 2004 #5


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    No, mathman the word is "discrete" in either sense. There is no (English) word spelled "discreet".
  7. Sep 22, 2004 #6
  8. Sep 23, 2004 #7
    and in my little oxford lol. prudent; cautions in speech or action; unobtrusive.
  9. Sep 23, 2004 #8


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    What? ME- Wrong?? How can this be allowed to happen!! I'm going to call Brittanica immediately and insist that they change the spelling!!
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