## Edge diffraction of creeping rays

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S. J. Chapman, J. R. Ockendon &
V. H. Saward

Explicit formulae are derived
for waves modelled by the scalar two-dimensional Helmholtz equation
for the field that is diffracted when surface creeping rays encounter
an infinitely sharp edge. Both Neumann and Dirichlet boundary
conditions are analysed, and the diffracted field is found to be an
order of magnitude smaller in the latter case.