What is it about?
It is shown that the Beta integral that Euler calculated in 1730, Mengoli had already calculated in 1659, for natural numbers, and in 1672 for semi-integer numbers, by another path of exploration.
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Why is it important?
The main result of this article is to show these calculations with their symbolic language and to analyze how Mengoli, through the definitions and theorems that he develops, shows the relationship between the values of the integrals and the exponents of the integrated algebraic expression. Our findings provide us with a new vision of Mengoli's ideas on the algorithmic calculus of quadratures, placing him as a pioneer in the integral calculus of the 17th century.
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This page is a summary of: Euler’s beta integral in Pietro Mengoli’s works, Archive for History of Exact Sciences, March 2009, Springer Science + Business Media,
DOI: 10.1007/s00407-009-0042-5.
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