 \vec{ i } 

 \vec{ j } 

 \vec{ u } 

 \vec{ v } 

O = Intersect(xAxis, yAxis)
U = Point(xAxis)
V = Point(yAxis)
u_1 = Vector(O, U)
v_1 = Vector(O, V)
i = (0, 1)
A = (4, 0)
B = (4, 4)
C = (0, 4)
u = Vector(A, B)
v = Vector(C, B)
m = 3.6 (slider from 0 to 4, step 0.1)
M: A + m * u
N: C - m * v
a = Segment(N, M)
Ω = Midpoint(N, M)