31. This is actually good news to physicists, because proposed theories can accommodate changes in the fine structure constant over time. 32. To lowest order in the fine-structure constant , \ alpha, the QED result for the electrostatic potential of a point charge is: 33. I got particularly strange big red text errors replacing the math that should be on the page " Fine-structure constant ". 34. The Killing form and the Casimir invariant also have a particularly simple form, when written in terms of the structure constants . 35. The structure constants " f abc " are totally antisymmetric in all indices analogous to those of SU ( 2 ). 36. For the abelian case, all the structure constants f ^ { abc } are zero and so there is no coupling. 37. Geonium studies of electrons and positrons are one of the best tests of QED and yield precise determinations of the fine-structure constant . 38. Where the structure constant is the Levi-Civita symbol, Einstein summation notation is used, is the Kronecker delta, and is the identity matrix. 39. The most precise and specific tests of QED consist of measurements of the electromagnetic fine structure constant , ?, in various physical systems. 40. The structure constants play a role in Lie algebra representations, and in fact, give exactly the matrix elements of the adjoint representation.
