Self-Adjoint Operators

Spectral Theory Cite
Primary: von Neumann, spectral theorem
Publication: Self-adjoint operators
Year: 1920s
URL: Wikipedia

T=T*. σ(T)⊂ℝ. Spectral theorem: T=∫λ dE. Functional calculus.

graph TD D1["Def: T*=T\nself-adjoint"] D2["Def: Symmetric\n〈Tx,y〉=〈x,Ty〉 dense"] D3["Def: Spectral measure\nE(Δ) projection"] D4["Def: Resolution of identity"] T1["Thm: σT ⊂ ℝ"] T2["Thm: Spect thm\nT=∫λ dE_λ"] T3["Thm: fT = ∫fλ dE\nfunc calculus"] T4["Thm: Ess spectrum\nσ_ess"] T5["Thm: Discrete spectrum\nisolated eigenval"] D1 --> T1 D2 --> D1 D3 --> T2 D4 --> T2 T2 --> T3 T1 --> T4 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