Horizontal surface in a Seifert fibered space
= Horizontal surface in a Seifert fibered space
= Horizontal surfaces in a Seifert fibered space
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A horizontal surface is a properly embedded <topological surface> transverse to every <Seifert fiber>. Its projection to the base <orbifold> is an orbifold covering. The covering degree is its intersection number with a regular <Seifert fiber>.