Fig. 1
Four examples of dislocations in the propagation of a wave with the time in abscissas and a distance in ordinates. From left to right, a vortex, two edges, and a gliding edge, all with charge 1. Around the second edge dislocation, a closed curve has been drawn with dots and squares. The integral of the phase along this curve, the monodromy, is non-zero.
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