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

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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

$\arg \left({-1 - i}\right) = -\dfrac \pi 4$


The correct result is:

$\arg \left({-1 - i}\right) = -\dfrac {3 \pi} 4$


Sources