log(exp X · exp Y) = X + Y + ½[X,Y] + (1/12)([X,[X,Y]] - [Y,[X,Y]]) + ... Series in iterated brackets. Foundation for relating Lie group multiplication to Lie algebra. Critical in quantum mechanics product expansions.
log(exp X · exp Y) = X + Y + ½[X,Y] + (1/12)([X,[X,Y]] - [Y,[X,Y]]) + ... Series in iterated brackets. Foundation for relating Lie group multiplication to Lie algebra. Critical in quantum mechanics product expansions.