Gasket
Readouts
Circles drawn
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Largest curvature
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Descartes check
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Fractal dimension
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Descartes: (k1+k2+k3+k4)^2 = 2(k1^2+k2^2+k3^2+k4^2). New circle: k4' = 2(k1+k2+k3)-k4, applied to complex centres too. Gasket dimension ~ 1.3057.