Source authenticated

The isoperimetric conjecture for the cubic flat three-torus (balls, tubes, slabs)

Claims the full isoperimetric profile of R3/Z3\mathbb R^3/\mathbb Z^3, I(V)=min⁡{(36π)1/3v2/3,2πv,2}I(V)=\min\{(36\pi)^{1/3}v^{2/3},2\sqrt{\pi v},2\}, and a classification of all finite-perimeter minimizers: balls for V≤4π/81V\le4\pi/81, tubes about shortest geodesics for 4π/81≤V≤1/π4\pi/81\le V\le1/\pi, coordinate slabs for 1/π≤V≤1/21/\pi\le V\le1/2, complements above 1/21/2, with exactly the two adjacent types at each transition volume. The new step excludes three- and four-vertex nonstandard configurations at the two transition volumes via nested planar sections. It does NOT treat non-cubic flat tori, the cube with relative perimeter beyond the reflection correspondence, or higher dimensions.

Exact FrontierDelta

Prior state unknown→proved

Scope and record

Occurred: Sep 24, 2026

Delta type: SOURCE CLAIM

Assumptions: VibeMathed verification: lean-checked. Publication: announcement. AI contribution: ai-discovered. VibeMathed editorial classifications, scores, notes, relations, and dataset structure are CC BY 4.0. Source statements and linked content retain their own rights.

Canonical aliases: The isoperimetric conjecture for the cubic flat three-torus (balls, tubes, slabs) · Isoperimetric problem in the cubic 3-torus

Confidence: Not scored

Registry verification: lean checked · announcement · candidate

Open the source record ↗

Attribution

VibeMathed
registry · event recorded by

Unreleased internal OpenAI model
model · ai model contributor · OpenAI

Artifacts and verifiers

Lean formalization: isoperimetric profile and minimizers of the cubic three-torus

lean artifact · pending

Artifact ↗
Lean comparator statement: CubicTorus

lean artifact · pending

Artifact ↗

Compute record

No linked compute attempts recorded.

Lineage and corrections

The isoperimetric conjecture for the cubic flat three-torus (balls, tubes, slabs) evidence for this event

The isoperimetric conjecture for the cubic flat three-torus (balls, tubes, slabs) parent of this event

This event attributed to Unreleased internal OpenAI model

VibeMathed record: The isoperimetric conjecture for the cubic flat three-torus (balls, tubes, slabs) evidence for this event

Lean formalization: isoperimetric profile and minimizers of the cubic three-torus evidence for this event

Hauswirth, Perez, Romon and Ros, The periodic isoperimetric problem (2004) evidence for this event

Lean comparator statement: CubicTorus evidence for this event

Claims the full isoperimetric profile of R3/Z3\mathbb R^3/\mathbb Z^3, I(V)=min⁡{(36π)1/3v2/3,2πv,2}I(V)=\min\{(36\pi)^{1/3}v^{2/3},2\sqrt{\pi v},2\}, and a classification of all finite-perimeter minimizers: balls for V≤4π/81V\le4\pi/81, tubes about shortest geodesics for 4π/81≤V≤1/π4\pi/81\le V\le1/\pi, coordinate slabs for 1/π≤V≤1/21/\pi\le V\le1/2, complements above 1/21/2, with exactly the two adjacent types at each transition volume. The new step excludes three- and four-vertex nonstandard configurations at the two transition volumes via nested planar sections. It does NOT treat non-cubic flat tori, the cube with relative perimeter beyond the reflection correspondence, or higher dimensions. parent of this event

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