# Discreet math question

1. Sep 21, 2004

### bkc82

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. Sep 21, 2004

### Hurkyl

Staff Emeritus
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.

3. Sep 21, 2004

### bkc82

Thanks I appreciate it.

4. Sep 21, 2004

### mathman

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.

5. Sep 22, 2004

### HallsofIvy

No, mathman the word is "discrete" in either sense. There is no (English) word spelled "discreet".

6. Sep 22, 2004

### Muzza

http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=discreet&x=0&y=0 [Broken]

Last edited by a moderator: May 1, 2017
7. Sep 23, 2004

### gazzo

and in my little oxford lol. prudent; cautions in speech or action; unobtrusive.

8. Sep 23, 2004

### HallsofIvy

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