/usr/share/ri/1.8/system/Math/ is in ri1.8 1.8.7.352-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/ri/1.8/system/Math/acos-c.yaml
/usr/share/ri/1.8/system/Math/acos-i.yaml
/usr/share/ri/1.8/system/Math/acosh-c.yaml
/usr/share/ri/1.8/system/Math/acosh-i.yaml
/usr/share/ri/1.8/system/Math/asin-c.yaml
/usr/share/ri/1.8/system/Math/asin-i.yaml
/usr/share/ri/1.8/system/Math/asinh-c.yaml
/usr/share/ri/1.8/system/Math/asinh-i.yaml
/usr/share/ri/1.8/system/Math/atan-c.yaml
/usr/share/ri/1.8/system/Math/atan-i.yaml
/usr/share/ri/1.8/system/Math/atan2-c.yaml
/usr/share/ri/1.8/system/Math/atan2-i.yaml
/usr/share/ri/1.8/system/Math/atanh-c.yaml
/usr/share/ri/1.8/system/Math/atanh-i.yaml
/usr/share/ri/1.8/system/Math/cdesc-Math.yaml
/usr/share/ri/1.8/system/Math/cos-c.yaml
/usr/share/ri/1.8/system/Math/cos-i.yaml
/usr/share/ri/1.8/system/Math/cosh-c.yaml
/usr/share/ri/1.8/system/Math/cosh-i.yaml
/usr/share/ri/1.8/system/Math/erf-c.yaml
/usr/share/ri/1.8/system/Math/erfc-c.yaml
/usr/share/ri/1.8/system/Math/exp-c.yaml
/usr/share/ri/1.8/system/Math/exp-i.yaml
/usr/share/ri/1.8/system/Math/frexp-c.yaml
/usr/share/ri/1.8/system/Math/hypot-c.yaml
/usr/share/ri/1.8/system/Math/ldexp-c.yaml
/usr/share/ri/1.8/system/Math/log-c.yaml
/usr/share/ri/1.8/system/Math/log-i.yaml
/usr/share/ri/1.8/system/Math/log10-c.yaml
/usr/share/ri/1.8/system/Math/log10-i.yaml
/usr/share/ri/1.8/system/Math/rsqrt-i.yaml
/usr/share/ri/1.8/system/Math/sin-c.yaml
/usr/share/ri/1.8/system/Math/sin-i.yaml
/usr/share/ri/1.8/system/Math/sinh-c.yaml
/usr/share/ri/1.8/system/Math/sinh-i.yaml
/usr/share/ri/1.8/system/Math/sqrt-c.yaml
/usr/share/ri/1.8/system/Math/sqrt-i.yaml
/usr/share/ri/1.8/system/Math/tan-c.yaml
/usr/share/ri/1.8/system/Math/tan-i.yaml
/usr/share/ri/1.8/system/Math/tanh-c.yaml
/usr/share/ri/1.8/system/Math/tanh-i.yaml