Alphabeta Math
False statementConstruction: Literature-sourcedVerification: AI-adaptedSession-authored (Fable 5 assisted)precheck passjudge pass (gpt-5.6-terra)audited 2026-08-26
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.

FALSE: every continuous preimage of a Lebesgue measurable subset of R is Lebesgue measurable

Statement

Every continuous preimage of a Lebesgue measurable subset of R is Lebesgue measurable.

Facts & Assumptions

Given: The Axiom of Choice.

[L1]

A continuous preimage of a Lebesgue measurable subset of R can be nonmeasurable (A continuous preimage of a Lebesgue measurable subset of R can be nonmeasurable).

Refutation

technique · direct
1.1

By [L1] choose a measurable subset E⊆R and a continuous map g whose preimage of E is not measurable.

L1
2.1

This witness refutes the universal claim.

step 1.1∎

Depends on

Used by

Nothing in the library uses this result yet.

Dependency tree · two levels

7 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