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# Linear algebra

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1. Let a1, a2, a3 be linearly independent vectors in R3, and let A = [a1 a2 a3]. Which of the following statements are true?
a) The reduced row echelon form of A is I3
b) The rank of A is 3
c) The system [A|b] has a unique solution for any vector b in R3
d) (a), (b) and (c) are all true
e) (a) and (b) are both true, but not (c)

2. Show that span (u,v) = span (u, u+v) for any vectors u and v.
3. If A is a diagonalisable matrix and all of its eigenvalues satisfy |Î»| < 1, prove that An approaches the zero matrix as n gets large.
4. Prove that given any n real numbers &#955;1, ..., Î»n, there exists a symmetric n x n matrix with Î»1, ..., &#955;n as its eigenvalues.
5. Find the LU factorisation of the matrix shown below:

A =
6. Write the given permutation matrix shown below; as a product of elementary (row interchange) matrices.

B = ?

https://brainmass.com/math/linear-algebra/linear-algebra-span-lu-factoring-180472

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