/usr/include/BALL/MATHS/ is in libball1.4-dev 1.4.3~beta1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/BALL/MATHS/FFT1D.h
/usr/include/BALL/MATHS/FFT2D.h
/usr/include/BALL/MATHS/FFT3D.h
/usr/include/BALL/MATHS/analyticalGeometry.h
/usr/include/BALL/MATHS/angle.h
/usr/include/BALL/MATHS/box3.h
/usr/include/BALL/MATHS/circle3.h
/usr/include/BALL/MATHS/common.h
/usr/include/BALL/MATHS/complex.h
/usr/include/BALL/MATHS/cubicSpline1D.h
/usr/include/BALL/MATHS/cubicSpline2D.h
/usr/include/BALL/MATHS/fftwCommon.h
/usr/include/BALL/MATHS/function.h
/usr/include/BALL/MATHS/line3.h
/usr/include/BALL/MATHS/maths.doc
/usr/include/BALL/MATHS/matrix44.h
/usr/include/BALL/MATHS/numericalIntegrator.h
/usr/include/BALL/MATHS/parsedFunction.h
/usr/include/BALL/MATHS/piecewiseFunction.h
/usr/include/BALL/MATHS/piecewisePolynomial.h
/usr/include/BALL/MATHS/plane3.h
/usr/include/BALL/MATHS/quaternion.h
/usr/include/BALL/MATHS/randomNumberGenerator.h
/usr/include/BALL/MATHS/rombergIntegrator.h
/usr/include/BALL/MATHS/simpleBox3.h
/usr/include/BALL/MATHS/sources.cmake
/usr/include/BALL/MATHS/sphere3.h
/usr/include/BALL/MATHS/surface.h
/usr/include/BALL/MATHS/vector2.h
/usr/include/BALL/MATHS/vector3.h
/usr/include/BALL/MATHS/vector4.h