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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. [  ]
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 Riemann–Hurwitz formula
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 /wikipedia/en/Zeuthen_theorem
 /wikipedia/fr/Th$00E9or$00E8me_de_RiemannHurwitz
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 /wikipedia/en/Zeuthen$0027s_theorem
 /wikipedia/ko_id/1049643
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 RiemannHurwitz formula
 
 
Topic equivalent webpage
 http://en.wikipedia.org/wiki/index.html?curid=497413
 http://de.wikipedia.org/wiki/index.html?curid=1666491
 http://fr.wikipedia.org/wiki/index.html?curid=1064915
 http://de.wikipedia.org/wiki/Formel_von_RiemannHurwitz
 http://fr.wikipedia.org/wiki/Formule_de_RiemannHurwitz
 http://en.wikipedia.org/wiki/Riemann–Hurwitz_formula
 http://ko.wikipedia.org/wiki/리만후르비츠_공식
 http://ko.wikipedia.org/wiki/index.html?curid=1049643
 http://ja.wikipedia.org/wiki/リーマン・フルヴィッツの公式
 http://nl.wikipedia.org/wiki/Formule_van_RiemannHurwitz
 
 
 
 
 
 

 
 