/usr/include/dune/istl/diagonalmatrix.hh is in libdune-istl-dev 2.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vi: set et ts=4 sw=2 sts=2:
/*! \file
\brief This file implements a quadratic diagonal matrix of fixed size.
\deprecated Use the corresponding file from dune-common instead!
*/
#warning The file diagonalmatrix.hh has moved from dune-istl to dune-common,\
and will be removed from dune-istl after dune 2.3!
#include <dune/common/diagonalmatrix.hh>
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