/usr/include/madness/tensor/ is in libmadness-dev 0.10-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/madness/tensor/aligned.h
/usr/include/madness/tensor/basetensor.h
/usr/include/madness/tensor/cblas.h
/usr/include/madness/tensor/clapack.h
/usr/include/madness/tensor/distributed_matrix.h
/usr/include/madness/tensor/elem.h
/usr/include/madness/tensor/gentensor.h
/usr/include/madness/tensor/gmres.h
/usr/include/madness/tensor/lapack_functions.h
/usr/include/madness/tensor/mtxmq.h
/usr/include/madness/tensor/mxm.h
/usr/include/madness/tensor/slice.h
/usr/include/madness/tensor/solvers.cc
/usr/include/madness/tensor/solvers.h
/usr/include/madness/tensor/srconf.h
/usr/include/madness/tensor/systolic.h
/usr/include/madness/tensor/tensor.h
/usr/include/madness/tensor/tensor_lapack.h
/usr/include/madness/tensor/tensor_macros.h
/usr/include/madness/tensor/tensor_spec.h
/usr/include/madness/tensor/tensorexcept.h
/usr/include/madness/tensor/tensoriter.h
/usr/include/madness/tensor/tensoriter_spec.h
/usr/include/madness/tensor/tensortrain.h
/usr/include/madness/tensor/type_data.h
/usr/include/madness/tensor/vector_factory.h
/usr/include/madness/tensor/vmath.h