The Frankl-Peng-Rodl-Talbot Question on Turan Density Intervals
Frankl, Peng, Rodl and Talbot asked in 2007 whether the set of Turan densities of families of $r$-graphs contains intervals. It does: for every $r \ge 3$ the set contains non-degenerate intervals, including one of the form $[1-\delta_r, 1]$.
Exact FrontierDelta
Scope and record
Occurred: May 25, 2026
Delta type: SOURCE CLAIM
Assumptions: VibeMathed verification: unreviewed. Publication: preprint. AI contribution: ai-assisted. Imported under CC BY 4.0.
Canonical aliases: The Frankl-Peng-Rodl-Talbot Question on Turan Density Intervals · Turan density intervals
Confidence: Not scored
Registry verification: unreviewed · preprint · resolved
Attribution
VibeMathed
registry · event recorded by
Xizhi Liu
human · human collaborator
Oleg Pikhurko
human · human collaborator
ChatGPT 5.4 Pro
model · ai model contributor · OpenAI
ChatGPT 5.4 Thinking
model · ai model contributor · OpenAI
Lineage and corrections
This event attributed to Oleg Pikhurko
This event attributed to Xizhi Liu
This event attributed to ChatGPT 5.4 Thinking
This event attributed to ChatGPT 5.4 Pro