The claim
From MOM-CLM-165. Take the ways of being as a torsor under a group G, with α_ij ∈ G the offset that reconciles context i with context j. On a three-context cycle whose triple overlap is empty, the monodromy Φ = α₁₂ + α₂₃ + α₃₁ (TERM-046) is the Čech H¹ class. A global section, one coherent self (TERM-045), exists if and only if Φ = 0. With a two-set cover the nerve is an edge, so H¹ vanishes, and two locally consistent personas that agree on their overlap always glue. Compartmentalization, where every pair is fine and no whole is consistent, is a loop phenomenon.
The frustrated XY energy D(θ) = Σ[1 − cos(θ_j − θ_i − α_ij)] has a minimum in closed form, min_k 3(1 − cos((2πk − Φ)/3)), which is 0 exactly when Φ ≡ 0 mod 2π.
Why this record holds it
It is re-checked (history note). It also answers, in part, an objection this record left open. CLAIM-163 says “synchronization” of a self’s parts lacks a coupling, an order parameter and transitions. Here a self’s unity is literally a phase-synchronization problem: phases θ_i, couplings with offsets α_ij, and a global minimum that is zero or not. That holds within a model of contexts, not of interests over time. That bearing is this record’s.
What it does not say
- That the energy measures how dissociated someone is. D_min depends on Φ only up to a half-turn and is capped at 1.5. The obstruction class is the invariant. The energy is a bounded readout of it. MOM-CLM-165 says so.
- Anything about nonabelian targets, where the monodromy is order-dependent and there is no closed form.
- That the result is cover-independent. Only the cover-dependent readout has been computed, and refining three contexts into six can redistribute the frustration. MOM leaves this open, and so does this record.
Note of 2026-10-18: the same minimal obstruction for update demands
The exchange of 2026-10-17 built an ordinal account of frustration among an organization’s demands (CLAIM-347, TERM-060): demand i accepts a set A_i of transformations, and the jointly satisfiable sets form a downward-closed complex. A37 named this claim “the most direct existing Nucleation connection”. The shape is the same as here: pairs can be fine and a whole not. For local improvement demands on a learner, A_i = {d : g_iᵀd < 0}, three unit gradients at 120° are pairwise jointly improvable (no two are antiparallel) while no d improves all three, since their sum is zero. Pairwise non-conflict (every g_iᵀg_j ≥ 0) rules frustration out. So among non-antiparallel demands the minimal obstruction needs three, as here. This is the shape only. Set incompatibility supplies no torsor and no cycle class, and A37: “Not every optimization conflict has a cohomology class.” The two senses of frustration are kept apart in TERM-060.