curso de algebra linear - fundamentos e aplicaçoes - complemento - marco cabral e paulo goldfeld
TRANSCRIPT
7/21/2019 Curso de Algebra Linear - Fundamentos e Aplicaçoes - Complemento - Marco Cabral e Paulo Goldfeld
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Cn
2× 2 A
A
A
2 × 2
λ ∈ C/R
r, θ ∈ R r ≥ 0
0 ≤ θ < π
{u,v} R2
M =
↑u
↓
↑v
↓
M −1AM = I rRθ
I r = rI
r
Rθ
θ
A
r
w ∈ Cn
λ
λ
λ = r(cos θ + i sen θ)
w = u + iv u,v ∈ R2
Aw = λw
Aw = Au + iAv = λw = r(cos θ + i sen θ)(u + iv) = r(cos θu− sen θv + i(sen θu+ cos θv)).
Au = r(cos θu− sen θv) Av = r(sen θu + cos θv).
M Rθ AM = rM Rθ
M
M −1
Rθ = I Rθ
I
M
u v u = kv
k ∈ R w = (k + i)v w = (k− i)v = (k− i)/(k + i)w
w λ
Aw = λW
A
A = A
λ
w w
w = (k − i)/(k + i)w