For open spectral gaps, the Maslov bulk index, Chern number, edge index, and two spectral flows of a one-dimensional dislocation are all equal to the gap index (Schrödinger) or to 1 (Dirac).
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Edge states in ordinary differential equations for dislocations
For open spectral gaps, the Maslov bulk index, Chern number, edge index, and two spectral flows of a one-dimensional dislocation are all equal to the gap index (Schrödinger) or to 1 (Dirac).