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Updated: August 3, 2024
There is a short memoir of Ferrari in Opera, tom. ix. Opera, tom. i. p. 66. Fra Luca's book, Summa de Arithmetica Geometria Proportioni é Proportionalita, extends as far as the solution of quadratic equations, of which only the positive roots were used. At this time letters were rarely used to express known quantities.
I will, however, give one more example of its creative power. The problem of describing a Pentagon must have puzzled architects considerably in those early times, but this was again easily accomplished by means of the Vesica. This is also the method used in that old manuscript of the fifteenth century named "Geometria deutsch."
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