Italian mathematician whose influence may have been greater than is currently recognised.
- Documented the rules for multiplication involving negative numbers.
- Pioneered the work on the understanding of imaginary numbers, using as a springboard Cardano's Formula for the solution of the cubic.
Also worked as a civil engineer, gaining a high reputation for his involvement in the draining of the Val di Chiana marshes.
- Born: Jan 1526, Bologna, Papal States (now Italy)
- Died: 1572 or 1573, (probably) Rome, Papal States (now Italy)
- Attempted a translation of the Arithmetica of Diophantus.
- 1572: Algebra (3 volumes of 5)
- 1929: The last two volumes of Algebra published.
Also known as
Some sources report his first name as Raphael, which may be a mistake.
- John J. O'Connor and Edmund F. Robertson: "Rafael Bombelli": MacTutor History of Mathematics archive
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): Entry: Bombelli, Rafael (1526-72)
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): Entry: Bombelli, Rafael (1526-72)
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): Entry: Bombelli, Rafael (1526-72/3)