Galilei group The closed subgroup of GL(5,R) consisting of Galilei transformations, i.e., of matrices of the following block structure R v a0 1 t
0 0 1
where R ∈ SO(3), v, a ∈ R3, r ∈ R.
gamma function The complex function given by
N(z) = ∫ ∞
0 t z−1e−t dt
for complex z with positive real part.