Riemann–Hurwitz formula ^{en}
In mathematics, the Riemann–Hurwitz formula, named after Bernhard Riemann and Adolf Hurwitz, describes the relationship of the Euler characteristics of two surfaces when one is a ramified covering of the other. It therefore connects ramification with algebraic topology, in this case. It is a prototype result for many others, and is often applied in the theory of Riemann surfaces and algebraic curves. Wikipedia [  ]
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 Riemann–Hurwitz formula
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 RiemannHurwitz formula
 
 
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 http://de.wikipedia.org/wiki/index.html?curid=1666491
 http://fr.wikipedia.org/wiki/index.html?curid=1064915
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 http://en.wikipedia.org/wiki/Riemann–Hurwitz_formula
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 http://nl.wikipedia.org/wiki/Formule_van_RiemannHurwitz
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