Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:brassh:branches:science/openSUSE_Tumbleweed/home:brassh:branches:science.repo
zypper refresh
zypper install eigen3
Для openSUSE Slowroll запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:brassh:branches:science/openSUSE_Slowroll/home:brassh:branches:science.repo
zypper refresh
zypper install eigen3
Для 16.0 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:brassh:branches:science/16.0/home:brassh:branches:science.repo
zypper refresh
zypper install eigen3
Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:brassh:branches:science/15.6/home:brassh:branches:science.repo
zypper refresh
zypper install eigen3