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Reference.org
Normal crossing singularity
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<p>In <a href="/facts/Algebraic_geometry/rh7RHVp3">algebraic geometry</a> a normal crossing singularity is a singularity similar to a union of coordinate hyperplanes. The term can be confusing because normal crossing singularities are not usually <a href="/facts/Normal_schemes/TQ6cB9By">normal schemes</a> (in the sense of the local rings being integrally closed). </p>