u  =1 2 3
v  =2 3 4
u+v=3 5 7
2*u=2 4 6
u*2=2 4 6
w2=11 16 21
-u=-1 -2 -3
u%v      = 20
u.dot(v) = 20
x=1.23
x+5=6.23
5*x=6.15
False
d1 = 7.999999999999999e-001
d2 = 8.000000000000000e-001
True
d3 = 1.000000000000000e+000
d4 = 1.000000000000000e+000