# C270 final independent mathematical review

Reviewed the completed C270 report, checkpoint, and exact verifier. No material mathematical or provenance error found.

- The induced regular maps are the unique compositions with T8993 inverse, conditional on the inherited C266 inputs. The report properly limits that uniqueness claim.
- All four original BC, reflected AD, cumulative, and local seasonal labels agree; the negative-branch reversal and the two reversals in original SP Flood ancestry are correctly distinguished.
- The local J₁ identity holds for both matching components, and the3708 intermediate retains its prescribed branch.
- The bilateral inner11.5, same-season12, and outer12.5 spans are correct and are labeled as dependent display quantities.
- The hypothetical common affine center map has slope1/50 and would give pair width1/100. It is correctly used only as a diagnostic exclusion, not an admitted new scale.
- A separate verifier execution passed111 assertions and produced six evidence files in C270_review/final_replay.

No C271 work, wider Gear search, source modification, or upload was performed by this review.