feral 0.9.0

Sparse symmetric indefinite direct solver in pure Rust, with certified inertia counts.
Documentation 
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Feral
Copyright (c) 2026 John Kitchin
Licensed under the MIT License (see LICENSE).

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Third-Party Attributions
================================================================================

Feral incorporates algorithmic content derived from the SPRAL library
(Science and Technology Facilities Council), specifically the Hungarian matching
and MC64-style scaling routines. The Rust implementations in:

    src/scaling/hungarian.rs
    src/scaling/mc64.rs

are translations of the corresponding Fortran routines `hungarian_match`,
`hungarian_init_heuristic`, and `hungarian_wrapper` in `src/scaling.f90` of
SPRAL. SPRAL is distributed under the BSD-3-Clause license; the full license
text is reproduced in LICENSE-THIRD-PARTY.

A small number of numerical constants from SPRAL SSIDS (e.g. the
`SSIDS_DET_SMALL = 1e-20` zero-pivot threshold from `src/ssids/datatypes.f90`)
are also used and are cited in source comments.

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Feral's source comments cite the following projects for scholarly purposes
(algorithm references, parameter names, design rationale). No source code from
these projects is incorporated into Feral:

  - MUMPS 5.8.2 (CeCILL-C)        https://mumps-solver.org/
  - Ipopt 3.14   (EPL-2.0)        https://github.com/coin-or/Ipopt
  - faer-rs      (MIT)            https://github.com/sarah-quinones/faer-rs

Citations of the form `ref/<project>/path/file.ext:LINE` in source comments
refer to these upstream sources as scholarly references and do not indicate
incorporation of code. An audit of distinctive identifiers and constants from
each project found no matches outside the SPRAL-derived files listed above.