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Possibilities for Shafarevich-Tate Groups of Modular ... - William Stein

Possibilities for Shafarevich-Tate Groups of Modular ... - William Stein

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Pro<strong>of</strong> (3): Long Exact Sequence<br />

The long exact sequence <strong>of</strong> étale cohomology begins<br />

Take the p-power torsion in this exact sequence then use<br />

Mazur’s theorem. Next analyze the cokernel <strong>of</strong> δ…

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