Branch point structure of covering maps onto nonorientable surfaces
Branch point structure of covering maps onto nonorientable surfaces
Let <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="f colon upper M right-arrow upper N"> <mml:semantics> <mml:mrow> <mml:mi>f</mml:mi> <mml:mo>:</mml:mo> <mml:mi>M</mml:mi> <mml:mspace width="thinmathspace" /> <mml:mo stretchy="false">→<!-- → --></mml:mo> <mml:mspace width="thinmathspace" /> <mml:mi>N</mml:mi> </mml:mrow> <mml:annotation encoding="application/x-tex">f:M\, \to \,N</mml:annotation> </mml:semantics> </mml:math> </inline-formula> be a degree <italic>n</italic> branched cover onto a compact, connected nonorientable surface with branch …