Argument of Complex Number/Examples/-1-i/Mistake

Source Work

1960: Walter Ledermann: Complex Numbers:

Chapter $2$: Geometrical Representations

Example $\text{(iv)}$

This mistake can be seen in the $1960$ edition as published by Routledge & Kegan Paul.

Mistake

$\map \arg {-1 - i} = -\dfrac \pi 4$

The correct result is:

$\map \arg {-1 - i} = -\dfrac {3 \pi} 4$

Sources

• 1960: Walter Ledermann: Complex Numbers ... (previous) ... (next): $\S 2$. Geometrical Representations: Example $\text{(iv)}$