MIT License

Copyright (c) 2026 Evgeny Istomin

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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================================================================================
THIRD-PARTY SOFTWARE NOTICES
================================================================================

This project contains code adapted from the open-source projects listed below.
The adapted code retains the original copyright notice as required by its
license.

--------------------------------------------------------------------------------
pandapower / PYPOWER
--------------------------------------------------------------------------------

The power-flow numerics are adapted from pandapower, which in turn bundles
PYPOWER (a port of MATPOWER, PSERC). Both are distributed under the BSD 3-Clause
License (full text below).

Copyright (c) 2016-2025 by University of Kassel and Fraunhofer Institute for
Energy Economics and Energy System Technology (IEE), Kassel. All rights
reserved. (pandapower)

Copyright (c) 1996-2015, PSERC, and individual contributors (PYPOWER / MATPOWER).

Upstream: https://github.com/e2nIEE/pandapower
          https://github.com/rwl/PYPOWER

Files adapted from pandapower / PYPOWER into this project:

    pandapower/pypower/makeYbus.py
        -> gridpf/algebra/ybus.py            (Ybus / Yf / Yt assembly)
    pandapower/pypower/dSbus_dV.py
        -> gridpf/algebra/jacobian.py        (power-mismatch Jacobian blocks)
    pandapower/pypower/newtonpf.py
        -> gridpf/solvers/newton_raphson.py  (Newton-Raphson iteration)
    pandapower/pypower/gausspf.py
        -> gridpf/solvers/gauss_seidel.py    (Gauss-Seidel warm-start)
    pandapower/pypower/dcpf.py
        -> gridpf/solvers/dc_pf.py           (DC power-flow warm-start)

Adaptation summary: the PYPOWER layer (ppc_conversion, idx_bus, idx_brch,
ppoption) was removed; the code operates on this project's own opaque per-unit
contract (gridpf/contract/types.py::PFInput) instead of the PYPOWER case format,
and carries no print side effects.

BSD 3-Clause License
....................

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   this list of conditions and the following disclaimer.

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   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products derived from this
   software without specific prior written permission.

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