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Strong operator topology

Polar topology

Polar set

Locally integrable function

Locally convex topological vector space

Extreme point

Gram–Schmidt process

Krein–Milman theorem

Composition operator

Constructive quantum field theory

Cauchy–Schwarz inequality

Korn's inequality

Eigenfunction

Cholesky decomposition

Compact convergence

Compact operator

Spectral theory of compact operators

Compact embedding

Continuous functions on a compact Hausdorff space

Operator topologies

Operator algebra

Operator norm

James' space

Square-integrable function

Shift operator

Schauder fixed-point theorem

Projection (linear algebra)

Weakly measurable function