Minimal and characteristic polynomial

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Homework Help Overview

The discussion revolves around the minimal and characteristic polynomials of a linear transformation T defined on the space of n x n matrices over a field k, specifically focusing on the case where T is the transpose operation. Participants are exploring the implications of this transformation for different fields, including R, C, and F2.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants are attempting to identify a polynomial that satisfies the condition p(T) = 0, with some suggesting that the relationship T^2(M) = M could be pivotal in determining the minimal polynomial. Others are questioning how to express this relationship as a polynomial in T.

Discussion Status

The discussion is ongoing, with participants actively engaging in exploring the properties of the transformation T and its implications for the minimal polynomial. There is a recognition of the need to find a suitable polynomial, but no consensus has been reached on the specific form it should take.

Contextual Notes

Participants are working under the assumption that k can take on different values (R, C, F2) and are considering the implications of these choices on the properties of T. There is also an acknowledgment of the challenge in expressing the transformation in polynomial form.

specialnlovin
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Let V =Mn(k),n>1 and T:V→V defined by T(M)=Mt (transpose of M).
i) Find the minimal polynomial of T. Is T diagonalisable when k = R,C,F2?
ii) Suppose k = R. Find the characteristic polynomial chT .
I know that T2=T(Mt))=M and that has got to help me find the minimal polynomial
 
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You'll need to find a polynomial p(x)=x^n+...+a_1x+a_0, such that p(T)=0, i.e.

T^n+...+a_1T+a_0I=0

You know that T^2(M)=M, can you use this to find a suitable polynomial??
 
All i can think of is f(x)=1 or f(T)=I
 
Come on, how do you write T^2(M)=M as a polynomial in T??
 

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