Orthogonal and symmetric maps: Orthogonal maps
Orthogonal matrices
Consider the #(3\times3)#-matrix \[A = {{1}\over{7}} \, \matrix{3 & -2 & a \\ -6 & -3 & -2 \\ -2 & 6 & -3 \\ } \] where #a# is an integer.
For what integer value of #a# is #A# orthogonal?
For what integer value of #a# is #A# orthogonal?
#a = # |
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