Consider the matrix A = [ 0 1 0 0 0 1 k 3 0 ] wherek is an arbitrary constant. For which values of k does A have three distinct real eigenvalues? For which k does A have two distinct eigenvalues? Hint : Graph the function g ( λ ) = λ 3 − 3 λ . Find its local maxima and minima .
Consider the matrix A = [ 0 1 0 0 0 1 k 3 0 ] wherek is an arbitrary constant. For which values of k does A have three distinct real eigenvalues? For which k does A have two distinct eigenvalues? Hint : Graph the function g ( λ ) = λ 3 − 3 λ . Find its local maxima and minima .
Solution Summary: The author explains how to find the local maxima and minima of g.
Consider the matrix
A
=
[
0
1
0
0
0
1
k
3
0
]
wherek is an arbitrary constant. For which values of k does A have three distinct real eigenvalues? For which k does A have two distinct eigenvalues? Hint: Graph the function
g
(
λ
)
=
λ
3
−
3
λ
. Find its local maxima and minima.
Formula Formula A function f(x) attains a local maximum at x=a , if there exists a neighborhood (a−δ,a+δ) of a such that, f(x)<f(a), ∀ x∈(a−δ,a+δ),x≠a f(x)−f(a)<0, ∀ x∈(a−δ,a+δ),x≠a In such case, f(a) attains a local maximum value f(x) at x=a .
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