How statement and proof provenance work
The first chip identifies the source of the statement or construction; the second identifies the source of its local proof or verification.
- Literature-sourced: the exact statement appears in a cited source; only wording and notation differ.
- AI-adapted: a semantically identical restatement of literature-sourced material, modulo indexing, notation, and boundary cases adopted by the library.
- AI-generated: a genuinely novel statement formulated by AI, with no source for the claim itself.
These labels describe origin, not correctness: citations and verification chips remain separate evidence.
Composition satisfies |ST|\le|S|,|T|
Statement
Let , , and be normed spaces over the same scalar field. If and , then
Facts & Assumptions
Given: Bounded linear operators and .
The operator norm is the unit-ball supremum and satisfies for every vector (The operator norm as the least bound and as the unit-sphere or unit-ball supremum).
Bounded linear operators compose to a linear map, and denotes the bounded ones (The spaces (\mathcal B(X,Y)) and (\mathcal B(X)) of bounded linear operators).
Proof
Let satisfy . Then [L1] gives , and applying [L1] again to yields .
Step 1.1 holds for every in the unit ball of , so taking the supremum over that ball gives .
Depends on
Used by
- A semigroup with unbounded generator is not norm continuous at zero Corollary
- Contraction Hille-Yosida theorem Corollary
- C k map between Banach spaces Definition
- The transpose of a bounded operator Definition
- Adjoint, norm and trace of an operator of rank at most one Example
- The square of the Volterra operator has zero trace Example
- A semigroup with continuity at zero is uniformly bounded on every compact time interval Lemma
- A separably acting abelian von Neumann algebra has a self-adjoint generator Lemma
- Compositions with a compact operator are compact Lemma
- Continuity at time zero implies continuity of every orbit Lemma
- Neumann series and small perturbations of bounded inverses Lemma
- Resolvent identity and holomorphy for a closed operator Lemma
- Spectral product from traces of powers Lemma
- The exponential series of a bounded operator Lemma
- The generator commutes with the semigroup on its domain Lemma
- Bounded Yosida semigroups converge to the generated semigroup Theorem
- Chain sum product and composition rules for Banach derivatives Theorem
- Exponential bound for a C0-semigroup Theorem
- Hilbert Schmidt operators form a two sided ideal Theorem
- Hilbert-adjoint identities Theorem
- Inverse function theorem for Banach spaces Theorem
- Lumer-Phillips generation theorem Theorem
- Measurable essentially bounded operator fields act decomposably Theorem
- Pvm integral is a star homomorphism Theorem
- The method of continuity for a uniformly estimated affine family of bounded operators Theorem
- Trace class is a two sided Banach operator ideal Theorem
Dependency tree · two levels
5 results within two dependency steps of this one, each drawn at its shortest distance from it. An arrow runs from a result to what uses it, so the chart reads left to right and ends at this result, which carries a heavier outline. Every node is a link to that result. Click elsewhere on the chart to enlarge it.
Sources
- Gerald Teschl, Topics in Real and Functional Analysis (standard reference, not scraped)
- Theo Buhler and Dietmar A. Salamon, Functional Analysis (standard reference, not scraped)