UNREASONABLE EFFECTIVENESS OF NUMBER THEORY 7
CEILING
"WELLS"
CROSS-DIMENSION OF HALL
J FLOORJ
Figure 1. A reflection phase-grating, based on quadratic residues, for effective
scattering of waves. In this example residues are taken modulo p = 17. Such
structures are useful in radar and sonar the diffusion of coherent light, noise
abatement - and concert hall acoustics.
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