HalloHalloHallo

\begin{pmatrix} x_1' \ x_2' \end{pmatrix} = 
\frac{1}{\sqrt{x_1^2 + x_2^2}}
\cdot \begin{pmatrix} x_1 \ x_2 \end{pmatrix} 

\vec{x}

\vec{x}'

P = (0, 4)
Q = (0, 0)
g = Line(P, Q)
E1 = (0, 0)
E2: (4 | 0)
E3: (4 | 4)
E4: (0 | 4)
Rahmen, e1, e2, e3, e4 = Polygon(E1, E2, E3, E4)
X = Point(Rahmen)
A: {{1, -0.5}, {0.5, 1}}
v: (2, 0)
x1: x(X)
x2: y(X)
x1': (1 / (x1^(2) + x2^(2))^(1 / 2) * x1)
x2': (1 / (x1^(2) + x2^(2))^(1 / 2) * x2)
X': (x1' | x2')
f = Segment(X, X')
gL: -7
gR: 7
gU: -5
gO: 5