Man pages matching name math::vector::real::xs in section 3pm:

Math::Vector::Real::XS.3pm.en	debian 10 / libmath-vector-real-xs-perl
Math::Vector::Real::XS.3pm.en	debian 11 / libmath-vector-real-xs-perl
Math::Vector::Real::XS.3pm.en	debian 12 / libmath-vector-real-xs-perl