Posted by: Alexandre Borovik | August 14, 2014

## Fibonacci

It appears that Fibonacci was the first person in Europe to represent a real number in a place value system: he wrote a root of the equation

$x^3+2x^2+10x=20$

as

$1^{\circ}$ $26^{\prime}$ $7^{\prime\prime}$  $42^{\prime\prime\prime}$ .

## Responses

1. Meaning base 60? I.e., $1 + \frac{26}{60} + \frac{7}{60^2} + \frac{42}{60^3} + \ldots$?

2. Yes, base 60, of course.

3. And it is not true, although widely believed, that Fibonacci’s daughter was called Bunny.