Alphabeta Math
ExampleConstruction: AI-adaptedVerification: AI-generatedjudge pass (z-ai/glm-5.2)audited 2026-07-31
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.

For the lower-limit line, χ=d=L=c=ℵ0 and w=2ℵ0 under choice

Example

Assume Choice and let S be the lower-limit line. At x, the intervals [x,x+1/n) form a countable local base. No finite family is a local base: the intersection of finitely many neighbourhoods is still a neighbourhood and contains some y>x, whereas [x,y) cannot contain any member of a finite local base contained in that intersection. Hence χ(S)=ℵ0.

The rationals are countable and meet every nonempty half-open interval, so d(S)≤ℵ0; no finite set is dense, since a short half-open interval can avoid it. The published lower-limit-line lemma gives Lindelöfness, while the cover {[−n,n):n≥1} has no finite subcover, so d(S)=L(S)=ℵ0. Density bounds cellularity above, and the disjoint family {[n,n+1):n∈Z} bounds it below, giving c(S)=ℵ0.

All half-open intervals form a basis of cardinality at most ∣R∣2=∣R∣. Conversely, well order any basis and assign to each x its first member Bx with x∈Bx⊆[x,x+1); if x<y, then By cannot contain x, so Bx≠By. Thus w(S)=∣R∣=2ℵ0.

Depends on

Used by

Dependency tree · two levels

85 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