External review, round 2 of dressed fall v2 — Bodies as the source of the field, from the description language Ilanguage 1.b

06-ilang-source / 07-dressed-fall

07dressed fallverified

Determines the weight of a body with its own mark in the field of another source and whether such a body falls in the same way for all its clock levels and branches, and to which order.

External review, round 2 · reviews v2 · verdict: correct

# External verification: 07-dressed-fall

- **Subproject:** 06-ilang-source
- **Package:** 07-dressed-fall
- **Verified version:** v2
- **External round:** 2 of 3
- **Date:** 2026-10-19T13:16:48+02:00
- **Focus points:** none

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VERDICT: correct

## Summary

The held-body calculation correctly reduces to the lowest eigenvalue of the one-field-object contract, and the third-order perturbation calculation gives the required γ²g_s weight correction. The projected-band argument consistently derives the packet-averaged lattice acceleration at leading order τ², including the envelope-dependent factors. Within the explicitly stated isolation, preparation and sequential-expansion assumptions, the resulting level and branch dependence at relative order γ follows correctly. The supplied code and outputs support the required weight checks and the additional projected-lattice consistency checks.

## Issues

None.

## Focus points

None given.