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Skew symmetric matrix

  1. May 11, 2013 #1
    I am asking for some hints to solve this excercise. Given an invertible skew symmetric matrix $A$, then show that there are invertible matrices $ R, R^T$ such that $R^T A R = \begin{pmatrix} 0 & Id \\ -Id & 0 \end{pmatrix}$, meaning that this is a block matrix that has the identity matrix in two of the four blocks and the lower one with a negative sign.

    I am completely stuck!
     
  2. jcsd
  3. May 12, 2013 #2

    tiny-tim

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    anyone have a simple method for this? :smile:
     
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