Angular Momentum Diagrams

摘要: Abstract Starting from the simplest possible building blocks—a ket, a bra, time-reversed and bra—a diagrammatic formalism is developed for angular momentum coupling problems. The comprises Clebsch–Gordan coefficients as well 3 j m -symbols. idea of constructing invariants (internal lines) by contracting contragredient pairs quantities emphasized throughout. series, its extension to more than two momenta, introduced algebraically diagrammatically. Recoupling between bases obtained in different schemes connection recoupling irreducible n -symbols derived well-known rules due Jucys co-workers are group theoretical means simple their practical exploitation presented.