Operator Theory
- Adjoint
- Adjoint Operator
- Adomian Polynomial
- Almost Mathieu Operator
- Anticommutative
- Anticommutator
- Antilaplacian
- Antilinear
- Antisymmetric
- Antiunitary
- Arendt-Batty-Lyubich-Vũ Theorem
- Atkinson-Mingarelli Theorem
- Banach Adjoint
- BFSS Model
- Borichev-Tomilov Theorem
- Closable Operator
- Closed Operator
- Conformal Net
- Conjugate Transpose
- Contraction Semigroup
- Coulomb Hamiltonian
- Cyclic Operator
- Cyclic Vector
- Dirac Operator
- Dirichlet-to-Neumann Operator
- Dissipative Operator
- Exceptional Point
- Exponential Stability
- Fredholm Operator
- Gearhart-Prüss-Huang Theorem
- Ground State
- Haldane Conjecture
- Hermitian Operator
- Identity Operator
- Infinite Matrix
- Infinitesimal Generator
- Involution
- Ionization Conjecture
- Kato Problem
- Kohn-Sham Representability
- Koopman Operator
- Laughlin Spectral-Gap Conjecture
- Left Hilbert Algebra
- Lieb-Thirring Inequality
- Linear Operator
- Lumer-Phillips Theorem
- Nuclear Operator
- Operand
- Operator
- Operator Algebra
- Operator Extension
- Operator Spectrum
- Operator Theory
- Parity-Time Symmetry
- Perron-Frobenius Operator
- Point Spectrum
- Quantum Hamiltonian
- Quartic Oscillator
- Quasi-Exact Solvability
- Reeh-Schlieder Theorem
- Resolvent Operator
- Resolvent Set
- Right Hilbert Algebra
- Scattering Amplitude
- Scattering Length
- Scattering Operator
- Scattering Theory
- Schrödinger Operator
- Semigroup Stability
- Separating Vector
- Shift-Invariant Operator
- Shift Operator
- Strong Stability
- Strongly Continuous Semigroup
- Tomita-Takesaki Theory
- Unimodular Hilbert Algebra
- Unitary
- Wave Operator
- Weierstrass Operator