Frame
Click/drag on the film to pin its height to A (Shift = -A). The film relaxes to the minimal surface (Laplace equation for small slopes).
Readouts
Surface area
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Flat area
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Residual |lap z|
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Iterations
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Area = integral sqrt(1+|grad z|^2). Catenoid r = c cosh(z/c); it exists only if h/R < 1.3255; it beats two flat discs while its area < 2 pi R^2.