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This new integral of Lebesgue is proving itself a wonderful tool. I might compare it with a modern Krupp gun, so easily does it penetrate barriers which were impregnable.
Bulletin of the American Mathematical Society, vol. 23, 1916.
Loci: Convergence
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Mathematical Treasures
Nasir al-Din al-Tusi's Commentary on Euclid's Elements
Nasir al-Din al-Tusi (1201 – 1274) was a Persian astronomer and mathematician. He is noted for writing the first major work on pure trigonometry as well as for his commentaries on Greek works. This is a page from a later Arabic edition of his commentary on Euclid’s Elements, a page dealing with Euclid's method of exhaustion.