Luca Pacioli
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Fra. Luca Bartolomeo de Pacioli was an Italian mathematician, Franciscan friar, collaborator with Leonardo da Vinci, and an early contributor to the field now known as accounting. He is referred to as the father of accounting and bookkeeping and he was the first person to publish a work on the double-entry system of book-keeping on the continent. He was also called Luca di Borgo after his birthplace, Borgo Sansepolcro, Tuscany.
Portrait of Luca Pacioli, traditionally attributed to Jacopo de' Barbari, 1495
A woodcut of Pacioli which appears throughout the Summa de arithmetica
The first printed illustration of a rhombicuboctahedron, by Leonardo da Vinci, published in Divina proportione
Woodcut illustrating the proportions of the human face from the second part of Divina proportione, which covers the Vitruvian system
Mathematician
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A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change.
Euclid (holding calipers), Greek mathematician, known as the "Father of Geometry"
Emmy Noether, mathematical theorist and teacher
In 1938 in the United States, mathematicians were desired as teachers, calculating machine operators, mechanical engineers, accounting auditor bookkeepers, and actuary statisticians.