Seifert fiber space

== English == === Alternative forms === Seifert fibered space (chiefly US) Seifert fibre space (British and Canadian) Seifert fibred space (British and Canadian) === Etymology === Named after Herbert Seifert. === Noun === Seifert fiber space (plural Seifert fiber spaces) (topology, chiefly US) A fiber bundle whose fiber is the circle and whose base space is a two-dimensional orbifold. === Anagrams === Seifert fibre space