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Linear algebra: equivalence

  1. Apr 22, 2010 #1
    1. The problem statement, all variables and given/known data
    1) two linear transformations B and C are equivalent iff there exist invertible linear transformations P and Q such that PB=CQ
    2) if A and B are equivalent then so are A' and B' in dual space
    3) Do there exist linear transformations A and B such that A and B are equivalent but A^2 and B^2 are not?
    4) Does there exist a linear transformation A such that A is equivalent to a scalar a but A is not equal to a?


    3. The attempt at a solution
    I really don't know where to start. I know that if two l.ts. A and B are equivalent then (AB)^-1 = B^-1A^-1. But that's where I am now.
     
    Last edited: Apr 22, 2010
  2. jcsd
  3. Apr 22, 2010 #2
    Ok for the first question, two lts B and C are equivalent iff there exist lts E and F such that
    B = E^-1 C F
    Now let E = P and let F=Q, we have
    B= P^-1 C Q or PB = CQ so this means that the lts P and Q must be invertible?
     
  4. Apr 23, 2010 #3
    Can you please repeat your definition for equivalence between A and B? I'm not sure I follow.
     
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