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Let A be an algebra and X C A a subset. Recall that the centraliser of X in A is defined to be == C(X) = {a A | ax = xa for all x = X}. Let U = { (o b) : a, b, c & R} ≤ M₂(R). C as in Question 1. (i) Show that the centraliser of U in M₂(R) is: C(U) = {(o 9 ) ; a € R} . 0 : (ii) Let M=R2, the natural module for U. Show that Endu (M) = R. (iii) Find all one-dimensional submodules of M. (iv) Is MXY for some submodules X, Y of M? (no proof is required for this part.)

Let A be an algebra and X C A a subset. Recall that the centraliser of X in A is defined to be == C(X) = {a A | ax = xa for all x = X}. Let U = { (o b) : a, b, c & R} ≤ M₂(R). C as in Question 1. (i) Show that the centraliser of U in M₂(R) is: C(U) = {(o 9 ) ; a € R} . 0 : (ii) Let M=R2, the natural module for U. Show that Endu (M) = R. (iii) Find all one-dimensional submodules of M. (iv) Is MXY for some submodules X, Y of M? (no proof is required for this part.)

Linear Algebra: A Modern Introduction
Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter1: Vectors
Section1.1: The Geometry And Algebra Of Vectors
Problem 24EQ
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Let A be an algebra and X C A a subset. Recall that the centraliser of X in A is defined to be == C(X) = {a A | ax = xa for all x = X}. Let U = { (o b) : a, b, c & R} ≤ M₂(R). C as in Question 1. (i) Show that the centraliser of U in M₂(R) is: C(U) = {(o 9 ) ; a € R} . 0 : (ii) Let M=R2, the natural module for U. Show that Endu (M) = R. (iii) Find all one-dimensional submodules of M. (iv) Is MXY for some submodules X, Y of M? (no proof is required for this part.)
Transcribed Image Text:Let A be an algebra and X C A a subset. Recall that the centraliser of X in A is defined to be == C(X) = {a A | ax = xa for all x = X}. Let U = { (o b) : a, b, c & R} ≤ M₂(R). C as in Question 1. (i) Show that the centraliser of U in M₂(R) is: C(U) = {(o 9 ) ; a € R} . 0 : (ii) Let M=R2, the natural module for U. Show that Endu (M) = R. (iii) Find all one-dimensional submodules of M. (iv) Is MXY for some submodules X, Y of M? (no proof is required for this part.)
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