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.
A measurable function between measurable spaces
Definition
Let and be measurable spaces (Measurable spaces and measurable sets). A function is measurable when
Equivalently, the family
is a sigma-algebra on containing .
Depends on
Used by
- Higher-dimensional simple symmetric walks are transient Corollary
- One-dimensional simple symmetric walk is recurrent Corollary
- Two-dimensional simple symmetric walk is recurrent Corollary
- An orientation-reversing homeomorphism need not be quasiconformal Counterexample
- A simple function and its canonical representation Definition
- Borel functional calculus for a bounded normal operator Definition
- Borel measurable and Lebesgue measurable functions on ℝⁿ Definition
- Direct integral of a measurable Hilbert field Definition
- Measurable and decomposable operator fields Definition
- Measurable Hilbert field from a countable fundamental family Definition
- Measure kernel and probability kernel Definition
- Measure-preserving transformations and systems Definition
- Random elements and real random variables Definition
- Sections Eₓ, Eʸ, fₓ, and fʸ on a product Definition
- Spectral multiplicity function in the separable case Definition
- Systems of imprimitivity for a Borel G-space Definition
- The sigma-algebra generated by a function Definition
- Uniformly elliptic divergence-form operators and their sesquilinear forms Definition
- Gambler’s ruin from harmonicity Example
- Green kernel of a biased integer walk Example
- Multiplicity-two diagonal representation Example
- Negative drift gives a finite mean small-set hit Example
- Newton shell theorem from harmonic mean values Example
- Pvm of a multiplication operator Example
- The positive-type Gaussian on the real line and its cyclic model Example
- Absolute real powers are Borel measurable and convex Lemma
- Conull Borel uniformizations and Borel versions of measured suprema Lemma
- Diagonal multipliers form a von Neumann algebra Lemma
- Ergodic systems with regular orbits concentrate on one orbit Lemma
- Følner nets give Reiter nets Lemma
- Measurable dense selections for fields of nonempty compact sets Lemma
- Measurable Gram-Schmidt and constant-field trivializations on dimension strata Lemma
- Measurable sections have measurable pointwise inner products Lemma
- Operators commuting with a generating family of multiplications Lemma
- Reiter functions can be cut down to Følner sets Lemma
- Steinhaus and Pettis: Borel homomorphisms of second-countable locally compact groups are continuous Lemma
- The elliptic form is well defined and bounded on H¹ Lemma
- The layer-cake identity for integrable functions Lemma
- The truncated Riesz kernel is bounded on Lᵖ of a bounded set Lemma
- Weighted monomial integrals and monomial norms for the disc, ball and polydisc Lemma
…and 12 more results.
Dependency tree · two levels
2 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
- Sheldon Axler, Measure, Integration and Real Analysis, Section 2B (standard reference, not scraped)
- John K. Hunter, Measure Theory, Definition 3.1 (standard reference, not scraped)