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Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter4: Eigenvalues And Eigenvectors
Section4.6: Applications And The Perron-frobenius Theorem
Problem 70EQ
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9. Use the information that the functions 1, x, x², ...,
x" are linearly independent on the real line and the definition of linear
independence to prove directly that, for any constant r, the functions fo(x) = e TX, f, (x) = xe TX, f2(x) = x-e ™x,
...
%3D
fn(X) = x" e are linearly independent on the whole real line.
i...
If the functions f1, f2, f3, ., fn are linearly independent on the real line, then the identity c, f, (x) + C2f2(x) + ... + Cnfn (x) = 0
%3D
holds on I only when (1)
To prove that the functions fo(x) = e TX, f1(x) = xe "X, f2(x)= x²e x, .., fn(X) = x^e TX are linearly independent, the
corresponding identity is (2)
What is the next step to prove the given functions are linearly independent?
O A. Write the above sum in terms of the linear independent functions 1, x,
x2
x by isolating the
common factor, xe r
O B. Write the above sum in terms of the linear independent functions 1, x, x
..., x" by isolating the
common factor, x"erx.
O C. Write the above sum in terms of the linear independent functions 1, x, x,
uX
by isolating the
common factor, x²erx.
(2)
D. Write the above sum in terms of the linear independent functions 1, x, x, ...,
x by isolating the
common factor, e rx.
Apply the above property to the identity. Thus,
= 0.
(3)
Since the product of two terms is zero, either (3)
Can e rX be zero?
ON O
O Yes
Thus, (4)
,2
is true, if and only if
But the functions 1, x, x, .., x" are linearly independent. Therefore, (5)
(6)
the functions fo (x)= e rX, f,(x) = xe rX, f2(x) = x²e Tx,
f,(x) = x"e rx are linearly independent on
2X =
As (7).
%3D
the whole real line.
Transcribed Image Text:9. Use the information that the functions 1, x, x², ..., x" are linearly independent on the real line and the definition of linear independence to prove directly that, for any constant r, the functions fo(x) = e TX, f, (x) = xe TX, f2(x) = x-e ™x, ... %3D fn(X) = x" e are linearly independent on the whole real line. i... If the functions f1, f2, f3, ., fn are linearly independent on the real line, then the identity c, f, (x) + C2f2(x) + ... + Cnfn (x) = 0 %3D holds on I only when (1) To prove that the functions fo(x) = e TX, f1(x) = xe "X, f2(x)= x²e x, .., fn(X) = x^e TX are linearly independent, the corresponding identity is (2) What is the next step to prove the given functions are linearly independent? O A. Write the above sum in terms of the linear independent functions 1, x, x2 x by isolating the common factor, xe r O B. Write the above sum in terms of the linear independent functions 1, x, x ..., x" by isolating the common factor, x"erx. O C. Write the above sum in terms of the linear independent functions 1, x, x, uX by isolating the common factor, x²erx. (2) D. Write the above sum in terms of the linear independent functions 1, x, x, ..., x by isolating the common factor, e rx. Apply the above property to the identity. Thus, = 0. (3) Since the product of two terms is zero, either (3) Can e rX be zero? ON O O Yes Thus, (4) ,2 is true, if and only if But the functions 1, x, x, .., x" are linearly independent. Therefore, (5) (6) the functions fo (x)= e rX, f,(x) = xe rX, f2(x) = x²e Tx, f,(x) = x"e rx are linearly independent on 2X = As (7). %3D the whole real line.
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