# Row 28 — External Source Provenance

This is a source/provenance note for the executable candidate gate. It is not manuscript text.

Primary references used for external theorems/consistency checks:

1. **K. S. Babu, I. Gogoladze, K. Wang — “Gauged Baryon Parity and Nucleon Stability,” arXiv:hep-ph/0306003.**
   - anomaly-free discrete `Z6` in the SM including neutrino masses;
   - natural gauge-parent construction;
   - forbids all `DeltaB=1` and `DeltaB=2` effective operators;
   - first allowed `DeltaB=3` operators occur at dimension 15.
2. **S. Koren — “A Note on Proton Stability in the Standard Model,” arXiv:2204.01741.**
   - exact nonperturbative SM proton-stability symmetry and its generation dependence.
3. **I. García-Etxebarria, M. Montero — “Dai-Freed anomalies in particle physics,” arXiv:1808.00009.**
   - refined/global discrete-anomaly analysis;
   - baryon triality has a `Z9` anomaly that cancels when the number of generations is a multiple of three.

The Row 28 implementation distinguishes these established external results from UTFANSWF-specific candidate ingredients:

- UTFANSWF v22 topological hard selection `Ngen=3`;
- private rank-3/rank-2 SANSWF projector construction;
- candidate internal order-3 split and spectral boundary interpretation;
- protected-spectrum two-loop unification compatibility calculation.
