xcx 0.1.0

Exchange–correlation functionals for density-functional theory (DFT) — pure-Rust, libxc-compatible
Documentation 
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xcx — exchange–correlation functionals for density-functional theory (pure-Rust, libxc-compatible)
Copyright (c) 2026 Jiekang Tian and the xcx authors

Licensed under the Mozilla Public License, Version 2.0. The full license text
is in the accompanying LICENSE file and at https://mozilla.org/MPL/2.0/.

==============================================================================
Attribution and provenance
==============================================================================

Portions of this library are derived from libxc — in particular the functional
formulas, the reduced-variable helper layer, and several numerical-stability
reformulations:

    libxc — https://libxc.gitlab.io/
    Copyright (C) the libxc authors, including M. A. L. Marques, X. Andrade,
    S. Lehtola, and M. Oliveira.
    Licensed under the Mozilla Public License, Version 2.0.

The derived portions remain under the Mozilla Public License, Version 2.0 —
the same license under which the entire xcx crate is distributed.

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Per-file provenance
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Every functional source file carries one of the following tags in its header:

    Provenance: ported-from-libxc
        Derived from the corresponding libxc Maple/C source.

    Provenance: clean-room
        Implemented from the published literature, without reference to the
        libxc source.

See the individual file headers to determine the origin of any given
functional.