Please help me in finding the image of the strip $\lbrace (x,y) \in\mathbb{C} : mx-\pi
Where $m$ is any real number.
Please help me in finding the image of the strip $\lbrace (x,y) \in\mathbb{C} : mx-\pi
Where $m$ is any real number.
${\mathbb C}\setminus \{0\}$ as for any complex $(a,b)\neq0$, you can find $\rho>0$ and $\theta\in[-\pi,\pi]$ such that $(a,b)=\rho e^{i\theta}=e(\ln(\rho)+i\theta)$.
So take $x=\ln(\rho)$ and $y$ can be found in $[mx-\pi,mx+\pi]$ such that $y-\theta=2k\pi$ ($k\in\mathbb Z$)
Hence, $(x,y)$ is in your strip and $e^{(x+iy)}=(a,b)$
EDIT : except that your strip doesn't contain $y=mx\pm\pi$. So you will not have all points $\rho.e^{i.(m\rho+\pi)}$ that is some kind of spiral :
${\mathbb C}\setminus \{\rho.e^{i(m\rho+\pi)}\;|\;\rho\ge0\}$