Abstract
Let A denote an abelian variety over ℚ. We give the first known examples in which #Ш(A/ℚ) is neither a square nor twice a square. For example, let E be the elliptic curve y2 + y = x3 — x of conductor 37. We prove that for every odd prime p < 25000 (with p 37), there is a twist A of E x • • • x E (p —1 copies) such that #Ш(A/ℚ) = pn2 for some integer n. We prove this by showing under certain hypothesis on E and p that there is an exact sequence
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Stein, W.A. (2004). Shafarevich-Tate Groups of Nonsquare Order. In: Cremona, J.E., Lario, JC., Quer, J., Ribet, K.A. (eds) Modular Curves and Abelian Varieties. Progress in Mathematics, vol 224. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-7919-4_17
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