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Sep 21st, 2017
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  1. m =
  2. {{E^(-I*x*b/2), E^(I*x*b/2), -E^(-I*y*b/2), -E^(I*y*b/2), 0, 0},
  3. {I*x*E^(-I*x*b/2), -I*x*E^(I*x*b/2), -I*y*E^(-I*y*b/2), I*y*E^(I*y*b/2), 0, 0},
  4. {0, 0, -E^(I*y*b/2), -E^(-I*y*b/2), E^(I*x*b/2), E^(-I*x*b/2)},
  5. {0, 0, -I*y*E^(I*y*b/2), I*y*E^(-I*y*b/2), I*x*E^(I*x*b/2), -I*x*E^(-I*x*b/2)},
  6. {E^(-I*x*(a + b/2)), E^(I*x*(a + b/2)), 0, 0, 0, 0},
  7. {0, 0, 0, 0, E^(I*x*(a + b/2)), E^(-I*x*(a + b/2))}};
  8. ns = NullSpace[m]
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