- Operator theory
Operator theory also includes the study of algebras of operators.
Single operator theory
Single operator theory deals with the properties and classification of single operators. For example, the classification of normal operators in terms of their spectra falls into this category.
- Invariant subspace
- Functional calculus
- Spectral theory
- Compact operator
- Self-adjoint operator
- Unbounded operator
- Umbral calculus
- Contraction mapping
- Positive operator on a Hilbert space
- Nonnegative operator on a partially ordered vector space
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