# Arnauld's Paradox

## Contents

## Paradox

Suppose negative numbers exist.

Then:

- $\dfrac {-1} 1 = \dfrac 1 {-1}$

Thus the ratio of a smaller quantity to a larger quantity equals the ratio of the same larger quantity to the same smaller quantity.

## Resolution

## Source of Name

This entry was named for Antoine Arnauld.

## Sources

- 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): $-1$ and $i$