The Neron model over the Igusa curves
classification
🧮 math.AG
math.NT
keywords
characteristiccurvesigusaanalyzeattentionclassifycurvedegenerating
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We analyze the geometry of rational p-division points in degenerating families of elliptic curves in characteristic p. We classify the possible Kodaira symbols and determine for the Igusa moduli problem the reduction type of the universal curve. Special attention is paid to characteristic 2 and 3 where wild ramification and stacky phenomena show up.
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