/usr/include/libpwiz/pwiz/utility/math/ is in libpwiz-dev 3.0.4624-6ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libpwiz/pwiz/utility/math/HouseholderQR.hpp
/usr/include/libpwiz/pwiz/utility/math/LinearLeastSquares.hpp
/usr/include/libpwiz/pwiz/utility/math/LinearSolver.hpp
/usr/include/libpwiz/pwiz/utility/math/MatchedFilter.hpp
/usr/include/libpwiz/pwiz/utility/math/MatrixInverse.hpp
/usr/include/libpwiz/pwiz/utility/math/OrderedPair.hpp
/usr/include/libpwiz/pwiz/utility/math/Parabola.hpp
/usr/include/libpwiz/pwiz/utility/math/Stats.hpp
/usr/include/libpwiz/pwiz/utility/math/Types.hpp
/usr/include/libpwiz/pwiz/utility/math/erf.hpp
/usr/include/libpwiz/pwiz/utility/math/qr.hpp
/usr/include/libpwiz/pwiz/utility/math/round.hpp