Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Bounded Intervals

  1. Sep 25, 2005 #1
    "If I and J are bounded, then I[tex]\cap[/tex]J is also bounded."

    Now, I was able to do this using the definition of suprema and infima and so fourth, but it is one godawful mess. I could sumbit it as is, but I was wondering if there's an easier way.
     
  2. jcsd
  3. Sep 25, 2005 #2
    Why would you involve suprema and infima?

    Let C be an upper bound of I, and D an upper bound of J. Then max{C, D} is an upper bound of [tex]I \cap J[/tex]. Similarly for the lower bound.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook