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| The Cenotaph (and in the background the A-bomb dome) in Hiroshima. With a bit of imagination, we can even see "calculus" around us. The edges of the cross section may look parabolic, but in fact, it may well be an inverted catenary (the shape of a chain when you hold it from its two ends). The catenary and the parabola are quite similar in shape, but very different functions. If you still want more ask your nearest mathematician (or the web). |