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I place myself in a certain opposition to widespread views on the nature of the mathematical infinite.
Manfred Schroeder, Fractals, Chaos, Power Laws 1991
Loci: Convergence
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Mutually tangent circles
Three congruent circles of radius 6 inches are mutually tangent to one another. Compute the area enclosed between them. (Venable, Elements of Geometry, 1890)
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The answer is: 5.805 sq in