4 ms·
The two dimensional case is my favorite: let I be the identity matrix and J the "imaginary unit matrix" 0 -1 1 0, then JJ = -I = exp(Jπ) and exp(Jθ)
by jasomill 3y ago
The two dimensional case is my favorite: let I be the identity matrix and J the "imaginary unit matrix"
0 -1
1 0,
then JJ = -I = exp(Jπ) and exp(Jθ) =
cos(θ) -sin(θ)
sin(θ) cos(θ).