This paper introduces the Toroidal Quantized Dimensional Cell, or Toroidal QDC, as a compact closure-space representation of the Quantized Dimensional Ledger cell L3F2L³F²L3F2. The construction represents the three length powers and two frequency powers of the QDC as five compact closure cycles, TQDC5= (SL1) 3× (SF1) 2T⁵ₐ₃₂= (SL¹) ³ (SF¹) ²TQDC5= (SL1) 3× (SF1) 2. A QDL string mode is defined as an admissible harmonic winding path on this compact ledger-space geometry, with integer winding vector in Z5Z⁵Z5. The main formal result is the derivation of the QDC closure functional CQDC (w) =2 (wL1+wL2+wL3) −3 (wF1+wF2) Cₐ₃₂ (w) =2 (w₋₁+w₋₂+w₋₃) -3 (w₅₁+w₅₂) CQDC (w) =2 (wL1+wL2+wL3) −3 (wF1+wF2) as the unique primitive integer homomorphism on the five-cycle QDC winding lattice satisfying additivity, permutation symmetry among equivalent length and frequency cycles, nontriviality, primitiveness, and neutrality on the primitive L3F2L³F²L3F2 winding. Its kernel defines the first-pass QDC lattice, and closed modes admit a quantized closure level kQDCkₐ₃₂kQDC. The Toroidal QDC is not proposed as a literal Planck-scale torus in physical space. It is a compact closure geometry in dimensional-ledger space. Its purpose is to provide an auditable admissibility framework for classifying winding modes, operator transitions, Regge-zero kernel events, ultraviolet nonleakage, Planck-scale gravitational closure, mass-frequency occupancy, Koide-type flavor projection, Schwarzschild threshold behavior, and the particle-assignment problem. The paper proves the Planck-QDC identity GMP=LP3FP2GMP=LP³FP²GMP=LP3FP2, derives a Schwarzschild closure-level ladder RS (k) =2kQDCLPRS (k) =2kₐ₃₂LPRS (k) =2kQDCLP, reconstructs minimal Regge-zero residue factors as QDC winding-kernel events, develops a Planck-normalized mass-occupancy relation, and derives the Koide charged-lepton relation from a balanced QDC flavor-projection postulate. It also proves that QDC closure alone cannot uniquely assign physical particle identities. A complete particle assignment requires a sector-complete projection map that supplies spin, gauge, charge, chirality, flavor, and mass-sector information. The claim is structural and bounded: the Toroidal QDC does not by itself derive the Standard Model, prove string theory, or solve quantum gravity. It provides a compact, derived, and reproducible admissibility lattice on which more complete physical assignments and operator/amplitude audits can be built.
James D. Bourassa (Wed,) studied this question.