2. (a) Is the definition of det(T) well defined? What may go wrong? Prove that this definition is well-defined. 1 (b) Let λ be an eigenvalue of T : V → V and let 7 be an eigenvector with eigenvalue X. Then (T – \id)ī= 0. - This means that the linear transformation T Aid has a nontrivial kernel. Suppose B is a basis for V. Discuss with your group why we can deduce det ([T — Xid] ß) = 0.² (c) Conversely, show that if det ([T — \id]ß) = 0, then À is an eigenvalue of T. - (d) Show that det([T – Xid]Â) does not depend on our choice of basis B. That is choose a different basis A and show that det([T — \id]ß) = det([T — Xid]4). (e) Discuss with your group why part (d) shows that the characteristic polynomial on the top of this page is well defined.

Advanced Engineering Mathematics
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ISBN:9780470458365
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Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Given definitions:

Definition: Let V be a vector space of dimension n, and let T : V → V be a linear transformation. The determinant of T , denoted by det(T ), is defined to be det([T ]B ), where B is any basis for V .

Definition: Let V be a vector space of dimension n. The characteristic polynomial of the linear transformation T : V → V is the polynomial in the variable λ given by det([T − λid]B), where B is any basis of V .

Definition: Let V be an n dimensional vector space and let T : V → V be a linear transformation. A basis B = {b1,··· ,bn} of V is called an eigenbasis if all bi’s are eigenvectors of T.


For part (i), problem 1 is linked here:
https://www.bartleby.com/questions-and-answers/for-the-following-transformations-find-an-eigenvector-using-any-methods-you-can-think-of-including-b/7bf163e6-15fc-4ba0-91ac-24333f461731

2. (a) Is the definition of det (T) well defined? What may go wrong? Prove that this definition
is well-defined. 1
(b) Let λ be an eigenvalue of T : V → V and let ở be an eigenvector with eigenvalue λ.
Then
(T - Aid) = 0.
This means that the linear transformation T - Aid has a nontrivial kernel. Suppose B is
a basis for V. Discuss with your group why we can deduce
det ([T - Xid] B)
=
0.²
(c) Conversely, show that if det([T — \id]ß) = 0, then λ is an eigenvalue of T.
(d) Show that det ([T – Aid]3) does not depend on our choice of basis B. That is choose a
different basis A and show that det ([T - Aid] B) = det([T - Xid]A).
(e) Discuss with your group why part (d) shows that the characteristic polynomial on the
top of this page is well defined.
Transcribed Image Text:2. (a) Is the definition of det (T) well defined? What may go wrong? Prove that this definition is well-defined. 1 (b) Let λ be an eigenvalue of T : V → V and let ở be an eigenvector with eigenvalue λ. Then (T - Aid) = 0. This means that the linear transformation T - Aid has a nontrivial kernel. Suppose B is a basis for V. Discuss with your group why we can deduce det ([T - Xid] B) = 0.² (c) Conversely, show that if det([T — \id]ß) = 0, then λ is an eigenvalue of T. (d) Show that det ([T – Aid]3) does not depend on our choice of basis B. That is choose a different basis A and show that det ([T - Aid] B) = det([T - Xid]A). (e) Discuss with your group why part (d) shows that the characteristic polynomial on the top of this page is well defined.
(f) Let A and B be similar matrices and let r € F. Prove that A - rI and B – rI are
similar.
(g) Let B be a basis of V. Show that
([T - Aid]B) = [T]ß − \I
Conclude the characteristic polynomial of T is equal to det([T]B - XI).
(h) To find all the eigenvalues À of T, we find roots of det([T]ß — XI) = 0. Use the previous
parts to justify why this method works. Discuss with your groups what happens if we
choose a different basis.
(i) Find the characteristic polynomial and eigenvalues of the transformations in problem 1
using this method.
Transcribed Image Text:(f) Let A and B be similar matrices and let r € F. Prove that A - rI and B – rI are similar. (g) Let B be a basis of V. Show that ([T - Aid]B) = [T]ß − \I Conclude the characteristic polynomial of T is equal to det([T]B - XI). (h) To find all the eigenvalues À of T, we find roots of det([T]ß — XI) = 0. Use the previous parts to justify why this method works. Discuss with your groups what happens if we choose a different basis. (i) Find the characteristic polynomial and eigenvalues of the transformations in problem 1 using this method.
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