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In algebraic geometry normal crossings is the property of intersecting geometric objects to do it in a transversal way. ==Normal crossing divisors== In algebraic geometry, normal crossing divisors are a class of divisors which generalize the smooth divisors. Intuitively they cross only in a transversal way. Let ''A'' be an algebraic variety, and a reduced Cartier divisor, with its irreducible components. Then ''Z'' is called a smooth normal crossing divisor if either :(i) ''A'' is a curve, or :(ii) all are smooth, and for each component , is a smooth normal crossing divisor. Equivalently, one says that a reduced divisor has normal crossings if each point étale locally looks like the intersection of coordinate hyperplanes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Normal crossings」の詳細全文を読む スポンサード リンク
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