Spectrum & Resolvent

Spectral Theory Cite
Primary: Hilbert, von Neumann
Publication: Spectrum of operators
Year: 1920s
URL: Wikipedia

σ(T) spectrum, ρ(T) resolvent set. R_λ=(T−λI)⁻¹. Spectral radius r(T)=lim ‖Tⁿ‖^{1/n}.

graph TD D1["Def: σT spectrum\nT−λ not invertible"] D2["Def: Resolvent ρT\nℂ∖σT"] D3["Def: R_λ = T−λ⁻¹\nresolvent op"] D4["Def: Spectral radius\nrT = sup|λ|"] T1["Thm: σT closed\nnonempty if dim<∞"] T2["Thm: rT = lim ‖Tⁿ‖¹/ⁿ"] T3["Thm: Gelfand\nrT = sup spec"] T4["Thm: Resolvent analytic\non ρT"] T5["Thm: Neumann series\n‖T‖<1⇒(I−T)⁻¹"] D1 --> T1 D2 --> D3 D3 --> T4 D4 --> T2 T2 --> T3 T4 --> T5 classDef definition fill:#b197fc,color:#fff classDef theorem fill:#51cf66,color:#fff class D1,D2,D3,D4 definition class T1,T2,T3,T4,T5 theorem

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Frontier: math.SP