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.
The ZFC inequalities of Cichoń's diagram
Statement
In ZFC, the ten cardinals , , , , , , , , , and satisfy the standard Cichoń-diagram inequalities: the elementary ideal arrows, the null-to-meagre arrows, the cross-ideal arrows, the eventual-domination arrows stated below, and all their transitive consequences. No independence or completeness assertion is part of this theorem.
Facts & Assumptions
Given: The null and meagre ideals and eventual-domination cardinals in ZFC.
For , , , , and . (Elementary bounds on ideal cardinal invariants)
; their definitions and the ideal minima are evaluated in ZFC, where AC supplies cardinal comparison. (Basic bounding and dominating relations, Eventual domination and the numbers b and d, The Axiom of Choice)
Proof
Draw the ten named cardinals as nodes. For each of and , insert the four elementary arrows of [F1]. Insert the two null-to-meagre arrows of [F2], the six cross and bounding arrows of [F3], and from [F4]. Every inserted arrow is an inequality already proved under the same ZFC conventions.
If and are among these arrows, ordinal/cardinal order transitivity gives . Repeated application yields exactly the transitive consequences asserted in the Statement. The statement makes no claim that an omitted arrow is independent of ZFC or that a diagram drawing captures every possible relation. AC is used in the cited supplier proofs and in regarding the ten minima as comparable cardinals; no additional selection occurs in this assembly. ∎
Remarks
The diagram displays exactly the seventeen generating inequalities in [F1]–[F4]. An arrow from to means ; a directed path gives a transitive consequence. Crossings of curves are not additional nodes. The eight ideal invariants use the null and meagre ideals on , and and use eventual domination, as in the Facts above.
The figure illustrates the assembly in proof step 1.1; the rigorous proof uses the cited inequalities and order transitivity independently of the figure. It asserts neither independence of omitted arrows nor completeness of the relations shown.
Depends on
Used by
Nothing in the library uses this result yet.
Dependency tree · two levels
44 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
- Tomek Bartoszyński, Invariants of Measure and Category, Theorem 3.11, printed p.8 (standard reference, not scraped)