- Algebra Lineal David C Lay Solucionario Del
- David C Lay Linear Algebra
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7.1 SOLUTIONS
Notes: Students can profit by reviewing Section 5.3 (focusing on the Diagonalization Theorem) before working on this section. Theorems 1 and 2 and the calculations in Examples 2 and 3 are important for the sections that follow. Note that symmetric matrix means real symmetric matrix, because all matrices in the text have real entries, as mentioned at the beginning of this chapter. The exercises in this section have been constructed so that mastery of the Gram-Schmidt process is not needed.
Theorem 2 is easily proved for the 2 2 case:
Solucionario Algebra Lineal David C. Libro de Algebra Lineal y sus Aplicaciones David C. Libro de Calculo Varias Variables James Stewart 6t. Solucionario Raymond Chang 10ma edicion.
If ,a b
Ac d
= then ( )2 21 ( ) 4 .2 a d a d b = + + If b = 0 there is nothing to prove. Otherwise, there are two distinct eigenvalues, so A must be diagonalizable.
In each case, an eigenvector for is .db
1. Since 3 5
,5 7
TA A = = the matrix is symmetric.
2. Since 3 5
,5 3
TA A
= the matrix is not symmetric.
3. Since 2 2
,4 4
TA A = the matrix is not symmetric.
4. Since 0 8 38 0 2 ,3 2 0
TA A
= =
the matrix is symmetric.
5. Since 6 2 00 6 2 ,0 0 6
Algebra Lineal David C Lay Solucionario Del
TA A
David C Lay Linear Algebra
=
the matrix is not symmetric.
Algebra Lineal David C Lay Solucionario Y
6. Since A is not a square matrix TA A and the matrix is not symmetric.