Appendix A

This appendix contains the following files, referred to in the paper "The Brauer–Manin obstruction and Sha[2]":

  • groups (Adam Logan): a text file explaining step 2d of the algorithm (Section 3);
  • brauer.tar.gz (Adam Logan): MAGMA programs to compute Brauer–Manin obstruction on a degree 4 Del Pezzo surface;
  • transcript (Nils Bruin): a transcript of computations involving visibility of Sha[2] in the Jacobian of a genus 4 curve.