A Computably Enumerable tt-Degree Without Computably Enumerable Irreducible m-Degrees

Patrizio Cintioli

Some computably enumerable truth-table degree contains no computably enumerable irreducible many-one degree. Cintioli derives the example using Degtev’s c.e. semirecursive set with rigid complement and the fact that its simple-set representatives cannot be irreducible cylinders.

Sources for this record

What was already known

Jockusch proved every c.e. truth-table degree contains an irreducible many-one degree without requiring that degree to be c.e. Odifreddi asked whether the stronger c.e. version held.

AI involvement AI-centered

The author's acknowledgment states that Gemini Deep Think discovered the main negative result. The published structural argument was then fully reworked by Cintioli, so the AI credit is for the decisive result and initial route, not for the final wording or unchecked independent proof.

The named model discovered the main negative result, while the human author substantially reworked the entire argument before publication; the source does not document an autonomous complete final proof.

Importance Notable

Shows that the proposed c.e. strengthening fails.

Limitations

Gemini Deep Think found the negative result; Cintioli reworked and verified the published argument. The model’s original intermediate proof is not available.

Technical verification Formal (human)

Cintioli explicitly says he fully reworked and verified all arguments of the published proof. This is a source-reported completed human check by the named author.

Formal checking

Full reworking and verification of every argument in the published structural proof

Checker
Patrizio Cintioli, author
Scope
The existence of a c.e. tt-degree without any c.e. irreducible m-degree
Basis
Reported by the linked checker
Evidence source

Checking a formal statement does not establish that it matches the original problem.

Human understanding Full

Cintioli explains how rigid complements imply simplicity, why simple sets are not cylinders and how Degtev's uniqueness theorem gives the negative example.

Correction and publication history