Eikonal
Eikonal :
From the Greek word "eikon" which means "image". It was introduced in 1895 by H. Bruns to describe the phase function (or travel time) in wave solutions that can usefully be written A(x) exp[i ψ(x). Constant values of the eikonal represent surfaces of constant phase, or wavefronts. The eikonal equation is a partial differential equation for the eikonal
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