Man pages matching name fdim in section 3:

fdim.3.en	debian 10 / manpages-dev
fdim.3.ja	debian 10 / manpages-ja-dev
fdim.3.pl	debian 10 / manpages-pl-dev
fdim.3.en	debian 11 / manpages-dev
fdim.3.fr	debian 11 / manpages-fr-dev
fdim.3.ja	debian 11 / manpages-ja-dev
fdim.3.pl	debian 11 / manpages-pl-dev
fdim.3.en	debian 12 / manpages-dev
fdim.3.fr	debian 12 / manpages-fr-dev
fdim.3.ja	debian 12 / manpages-ja-dev
fdim.3.pl	debian 12 / manpages-pl-dev
fdim.3.ru	debian 12 / manpages-ru-dev