For elliptic curves with standard double covers and suitable reduction at a prime p, the number of common projective torsion points is at most 2p^3+8, with refinements and a conditional bad-reduction analogue.
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Explicit bounds on common projective torsion points of elliptic curves
For elliptic curves with standard double covers and suitable reduction at a prime p, the number of common projective torsion points is at most 2p^3+8, with refinements and a conditional bad-reduction analogue.