Results 1 to 3 of 3
Like Tree2Thanks
  • 2 Post By Deveno

Thread: I need a hint!

  1. #1
    Member
    Joined
    Jun 2013
    From
    Israel
    Posts
    158

    I need a hint!

    Hi, I have uploaded a picture that shows my question. Can someone give me a direction, I have been sitting on this for hours, I couldn't do it. I tried to use the fact that P and Q are invertible and tried to find A in block matrix and maybe somehow get something, I am trying random things, I don't really know what I am doing, so can someone give me a subtle hint, by that I mean a hint that doesn't show me what to do in every step of the solution but rather gives me a first step how to start solving it. Thank you.
    Attached Thumbnails Attached Thumbnails I need a hint!-hint.png  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Mar 2011
    From
    Tejas
    Posts
    3,546
    Thanks
    842

    Re: I need a hint!

    Row-reduce A, which will give you P as a product of elementary row-operation matrices.

    Column reduce rref(A) (row-reduced echeclon form of A), which will "diagonalize" the pivot columns giving you Q as a product of elementary column operations (which will be transposes of elementary row-operation matrices).

    What is your guess on the relationship between the size of I, and the rank of A?
    Thanks from HallsofIvy and mash
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Jun 2013
    From
    Israel
    Posts
    158

    Re: I need a hint!

    Thank you Deveno! The problem that I couldn't do it because I thought they wanted a specific number for I and I didn't how that was possible, I thought there was a trick or something, but it was an easy question after all.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Need a hint.
    Posted in the Advanced Applied Math Forum
    Replies: 1
    Last Post: Feb 3rd 2014, 08:05 AM
  2. Integral of x.arctan(x) with hint with hint
    Posted in the Calculus Forum
    Replies: 3
    Last Post: May 22nd 2010, 06:57 AM
  3. Help on Hint
    Posted in the Differential Geometry Forum
    Replies: 2
    Last Post: Feb 21st 2010, 07:57 PM
  4. Induction hint
    Posted in the Advanced Algebra Forum
    Replies: 0
    Last Post: Feb 6th 2008, 07:00 PM
  5. Integral hint
    Posted in the Calculus Forum
    Replies: 4
    Last Post: Jan 23rd 2008, 01:42 PM

Search Tags


/mathhelpforum @mathhelpforum