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

Hi all,Let λ>0 and define an equivalence relation on

  1. Jan 19, 2012 #1
    Hi all,

    Let λ>0 and define an equivalence relation on ℝn-{0} by

    (x~y) [itex]\Leftrightarrow[/itex] (there is an s[itex]\in[/itex]Z such that λsx=y)

    I would like to know what the quotient space ℝn-{0}/~ looks like. I know that it is a set of equivalence classes.

    To understand it better I wanted to see how it works for n=1. In that case I found that for all a[itex]\in[/itex] (1, λ] there is an equivalence class [a]. And for b[itex]\in[/itex] (λ, λ2] we have b=rλ where 1< r ≤ λ. But this means that b~r. So b[itex]\in[/itex][r] and we know that r[itex]\in[/itex] (1, λ]. The same idea holds for elements from the intervals (λi, λi+1]. Hence every element from (1, ∞) will be in an equivalence class which has a representative in (1, λ]. Am I seeing this correct?

    But how can I specify the equivalence classes of the rest of the elements of ℝ-{0}? (since λ > 1)

    The goal is, (eventually) to show that the quotientspace ℝn-{0}/~ is homeomorphic to S1 x Sn-1.

    I would really appreciate any help or hints, to make me understand better what they mean by quotientspace.

    Kind regards,
    J.
     
  2. jcsd
  3. Jan 19, 2012 #2

    micromass

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor
    Insights Author

    Re: Quotientspace

    For elements in ]0,1[, you can show that such elements are also equivalent to an element in [itex][1,\lambda[[/itex]

    For elements in [itex]]-\infty,0[[/itex], you can show it equivalent to something in [itex]]-\lambda,-1][/itex].
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Similar Discussions: Hi all,Let λ>0 and define an equivalence relation on
Loading...