Linear algebra find the minimal polynomial

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SUMMARY

The discussion focuses on finding the minimal polynomial for the linear operator M defined by the equation M^2 + 1_v = 0. The user rewrites the expression M^3 + 2M^2 + M + 3I_v using the relation M^2 = -1_v, resulting in M^3 + M + I_v. The user initially guesses the minimal polynomial to be x^3 - x - 1 but expresses uncertainty about its correctness. Ultimately, the user concludes that M^3 can be simplified to -M, which is a crucial insight for determining the minimal polynomial.

PREREQUISITES
  • Understanding of linear operators and their properties
  • Familiarity with polynomial equations and minimal polynomials
  • Knowledge of vector spaces and linear transformations
  • Basic skills in algebraic manipulation of expressions
NEXT STEPS
  • Study the properties of minimal polynomials in linear algebra
  • Learn about the Cayley-Hamilton theorem and its applications
  • Explore the relationship between eigenvalues and minimal polynomials
  • Investigate the implications of operator simplifications in linear transformations
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Students studying linear algebra, mathematicians focusing on operator theory, and educators teaching concepts related to minimal polynomials and linear transformations.

catsarebad
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Homework Statement


M: V -> V linear operator st M^2 + 1_v = 0
find the POSSIBILITIES for min. pol. of M^3+2M^2+M+3I_v


Homework Equations





The Attempt at a Solution



using M^2 = -1_v,
i rewrote the operator(?) as
M^3 + M + I_v

i don't know what to do. i guessed min poly to be like x^3-x-1
but what would be other possibilities. i seriously doubt the one i guessed is even correct.

i know that, if min poly is u(x) then u(M) = 0.
 
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catsarebad said:

Homework Statement


M: V -> V linear operator st M^2 + 1_v = 0
find the POSSIBILITIES for min. pol. of M^3+2M^2+M+3I_v


Homework Equations





The Attempt at a Solution



using M^2 = -1_v,
i rewrote the operator(?) as
M^3 + M + I_v

i don't know what to do. i guessed min poly to be like x^3-x-1
but what would be other possibilities. i seriously doubt the one i guessed is even correct.

i know that, if min poly is u(x) then u(M) = 0.

M^3=(-M), isn't it?
 
got it.
 

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