1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Notation question

  1. Nov 12, 2007 #1
    I have something like this:

    [tex]\bigcup^{N}_{1}x_{n}[/tex]

    What am I looking at? Is this [tex]x_{1}\cup x_{2}\cup x_{3}\cup ...\cup x_{N}[/tex]?
     
    Last edited: Nov 12, 2007
  2. jcsd
  3. Nov 12, 2007 #2

    Ben Niehoff

    User Avatar
    Science Advisor
    Gold Member

    Yes, it's a union over some collection of sets.
     
  4. Nov 12, 2007 #3

    JasonRox

    User Avatar
    Homework Helper
    Gold Member

    Not necessarily because N can be infinite say...

    x1 U x2 U x3 U ...

    But also, N can be uncountable, which means listing them in whatever way is pointless and incorrect.
     
  5. Nov 12, 2007 #4
    Thanks, Folland started using it without prior explanation (that I noticed).

    It's the only interpretation that I could think of that made sense, but I didn't want to guess since it's already part of one theorem and one definition and if I guessed wrong then everything I did using those could be thrown off.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Notation question
  1. Notation question (Replies: 1)

  2. Notation question (Replies: 2)

  3. Notation question. (Replies: 2)

  4. Question on notation (Replies: 5)

  5. Notation question (Replies: 4)

Loading...