Source authenticated

Seymour's Second Neighborhood Conjecture

minimum out-degree 7; the conjecture is open in general

Exact FrontierDelta

Prior state unknown→proved

Scope and record

Occurred: Jun 29, 2026

Delta type: SOURCE CLAIM

Assumptions: VibeMathed verification: unreviewed. Publication: preprint. AI contribution: ai-assisted. Imported under CC BY 4.0.

Canonical aliases: Seymour's Second Neighborhood Conjecture · Second neighborhood

Confidence: Not scored

Registry verification: unreviewed · preprint · partial

Attribution

VibeMathed
registry · event recorded by

Arpan Sadhukhan
human · human collaborator

R. B. Sandeep
human · human collaborator

Sagnik Sen
human · human collaborator

ChatGPT 5.5 Pro
model · ai model contributor · OpenAI

Lineage and corrections

This event attributed to Sagnik Sen

This event attributed to R. B. Sandeep

This event attributed to Arpan Sadhukhan

This event attributed to ChatGPT 5.5 Pro

Act on this frontier