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Changelog

All notable changes to this project are documented here. The format follows Keep a Changelog, and versions follow Semantic Versioning.

Versions are derived from git tags by setuptools-scm, so each released version below corresponds to a vX.Y.Z tag.

[Unreleased]

[1.0.1] - 2026-08-31

Documentation-only release. No changes to the public API or algorithm.

Added

  • CITATION.cff for citing the software, with author ORCIDs and the associated references.
  • README "Citation" section pointing to CITATION.cff.
  • README "Acknowledgments" section disclosing that portions of the codebase were developed with the assistance of Claude Code (Anthropic).

Changed

  • Added David Edward Bruschi to the author list.

[1.0.0] - 2026-08-04

First stable release. The public API is check_finiteness, FinitenessResult, DimensionResult, BosonicGenerator, FreeHamiltonian, Subspace, the multi-index constructors in operators.monomial, and the YAML schema in io.models. Incompatible changes to these will come with a major version bump.

Added

  • check_finiteness: table-based classification of a bosonic DLA as finite-dimensional, provably infinite-dimensional, or inconclusive (REMAINING, with the generators requiring further analysis returned).
  • Subspace decomposition of the skew-Hermitian Weyl algebra $\hat{A}n = G^0 \oplus G^1 \oplus G^2 \oplus G^= \oplus G^{om} \oplus G^\perp$, and the refinement into $G^2_F$, $G^2{core}$, $G^=_F$, $G^\perp_F$ via $\chi_F$.
  • FreeHamiltonian with span reduction (compute_F_prime) and the $\chi_F$ map.
  • BosonicGenerator basis elements $g_\pm^\gamma$ with canonical-index validation, and multi-index constructors gamma_from_iotas, gamma_from_iotas_sum.
  • YAML input format with pydantic validation, supporting explicit alpha/beta vectors or the compact iotas spelling, and one or several free Hamiltonians in omegas.
  • bosonic-dla command-line entry point with -v/--verbose logging.
  • py.typed marker: the package ships its annotations to downstream type checkers (PEP 561).

Known limitations

  • A REMAINING verdict is returned whenever more than one generator lies in $\langle G^\perp_F \cup T(G^2_F) \rangle$. Only the trivial single-generator case of Step 3 is resolved; the general case requires further analysis.
  • ZERO_TOL is an absolute tolerance ($10^{-12}$) and therefore presumes frequencies of order unity. Frequency units for which typical values are very small make the tolerance significant, and modes merely close in frequency may then be treated as exactly degenerate.