In Cardano's formula for the roots of the cubic there are negative numbers under the square roots if and only if all roots of the polinomial polynomial are real. That, and the fact that Cardano and his contemporaries didn't even believe in negative numbers.
|
2 | spelling | ||
|
|
||||
|
|
1 | [made Community Wiki] | ||
|
In Cardano's formula for the roots of the cubic there are negative numbers under the square roots if and only if all roots of the polinomial are real. That, and the fact that Cardano and his contemporaries didn't even believe in negative numbers. |
||||
