Recent results for rotations expressed as polynomials of spin matrices are derived here by elementary differential equation methods. Structural features of the results are then examined in the framework of biorthogonal systems, to obtain an alternate derivation. The central factorial numbers play key roles in both derivations.
Journal of Physics A Mathematical General
- Pub Date:
- January 2015
- Mathematical Physics;
- High Energy Physics - Theory;
- Quantum Physics
- 6 Figures. References updated in v2, along with some editing of text