It was shown in two earlier papers that, if u(x, t) = u(x1, x2, x3, t) satisfies the wave equation in the exterior of some fixed sphere r = a and vanishes for t ⩽ r, then ru(rξ, r + τ) ∼ f(ξ, τ) as r ...
One of the oldest problems in optics has been solved. Rafael Gonzalez from Mexico's Tecnologico de Monterrey has come up with an almost comically dense equation that can be used to almost completely ...
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