Question Number 110018 by mohammad17 last updated on 26/Aug/20
$${find}\:{the}\:{domain}\:{f}\left({x},{y}\right)={x}^{\mathrm{2}} −{y}^{\mathrm{2}} \\ $$
Answered by Aziztisffola last updated on 26/Aug/20
$$\mathbb{R}^{\mathrm{2}} \\ $$
Commented by aurpeyz last updated on 26/Aug/20
$${how}? \\ $$
Commented by mnjuly1970 last updated on 26/Aug/20
$$\mathrm{1}:\:{by}\:{lapplace} \\ $$$${transformation} \\ $$$$\mathrm{2}.{residual}\:{theory}\left({complex}\:{an}\right. \\ $$$$\left.{alysis}\right). \\ $$