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It is suspected that this is due to the practice of mathematicians at the time of publicly challenging one another. When a mathematician accepted another's challenge, each mathematician needed to solve the other's problems. The loser in a challenge often lost funding or his university position. Del Ferro was fearful of being challenged and likely kept his greatest work secret so that he could use it to defend himself in the event of a challenge.
Despite this secrecy, he had a notebook where he recorded all his important discoveries. After his death in 1526, this notebook was inherited by his son-in-law [[Annibale della Nave]]
In 1543, [[Gerolamo Cardano]] and [[Lodovico Ferrari]] (one of Cardano's students) travelled to [[Bologna]] to meet Nave and learn about his late father-in-law's notebook, where the solution to the depressed [[cubic equation]] disappeared.
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