Bin Derangements and the Gate Width Theorem
Nine multipliers produce zero collisions at every prime in base 10. The count is exactly b-1, independent of the prime. The proof identifies the deranging set explicitly.
spectral
Phase-Filtered Ramanujan Sums and the Spectral Gate
The last digit of a prime controls which spectral modes survive. A phase filter built from Ramanujan sums explains the gate, and the gate width is universal across primes.
The Autocorrelation Formula
The cross-spectral function had resisted a closed form. It turned out to factor through the digit function evaluated at shifted arguments. The formula closes the spectral chain.
The Spectral Power of the Digit Function
The squared bin sizes of the digit function control the alignment limit, the spectral structure, and the collision count. One object, three roles.
The Spectral Structure of Fractional Fields
The eigenvalues of the cross-alignment matrix are determined by the cyclic autocorrelation of the digit function. One formula gives the entire spectrum.
The Cross-Alignment Matrix
Compare every fraction to every other, digit by digit. The result is a symmetric matrix whose eigenvalues encode the internal structure of the fractional field.
The Coherence Decomposition
Alignment splits into two parts: a focused component from the repetend orbit, and a pairwise component from cross-matches. The decomposition explains why some integers are more coherent than others.