Man pages matching name erfc in section 3:

erfc.3.en	debian 10 / manpages-dev
erfc.3.es	debian 10 / manpages-es
erfc.3.ja	debian 10 / manpages-ja-dev
erfc.3.en	debian 11 / manpages-dev
erfc.3.fr	debian 11 / manpages-fr-dev
erfc.3.ja	debian 11 / manpages-ja-dev
erfc.3.en	debian 12 / manpages-dev
erfc.3.fr	debian 12 / manpages-fr-dev
erfc.3.ja	debian 12 / manpages-ja-dev
erfc.3.ru	debian 12 / manpages-ru-dev