/usr/share/man/man3/rgxg_number_greaterequal.3.gz is in librgxg-dev 0.1.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/rgxg_number_range.3.gz
/usr/share/man/man3/rgxg_number_range.3.gz