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April 30, 2026Open Access

TEBAC BSD-IV Split: Actual Coefficient Calculus for the Primitive Spectral Extractor

Key Points

This work aims to provide a complete coefficient calculus for the primitive spectral extractor in the context of BSD-IV.
Constructed the coefficient calculus after primitive-frame reduction.
Developed identity response matrices for local response functionals.
Utilized coordinate probes on local footprint spaces.
Demonstrated a closed form for the raw Mordell--Weil verification residue.
Established a strengthened source-complete actual extractor under specific conditions.

Abstract

This preprint continues the BSD-IV split sequence by supplying the actual coefficient-calculus construction needed after the primitive-frame reduction. It constructs a source-complete actual coefficient calculus for the primitive spectral extractor \ (^₄, \), admits coordinate probes on each local footprint space, and obtains the identity response matrix for the corresponding local response functionals. Consequently, the raw Mordell--Weil verification residue closes for the strengthened source-complete actual extractor: M^=0. \ The manuscript is status-explicit. It should be read as a Mordell--Weil bridge gate closure for the source-complete actual extractor, not as an unconditional closure of BSD-IV and not as a completed proof of the full Birch--Swinnerton--Dyer conjecture. The remaining BSD-IV front after this upload is the raw height comparison^₄, =BE^, *\, , \, _. \

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