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A proof related to 2 X 2 matrix

  1. Jun 19, 2015 #1
    Let A be a 2 X 2 matrix such that AX = XA for all 2 X 2 real matrices X. Show that A =kI for some k belonging to R
  2. jcsd
  3. Jun 19, 2015 #2


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    Staff: Mentor

    Welcome to the PF.

    This question needs to be posted in the Homework Help, Pre-Calculus Math forum, and you need to fill out the Homework Help Template you are provided there. That includes the section on your Attempt at the Solution. The New Member Introductions forum is for just that -- introducing yourself to the forum folks. This thread is locked.
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