I`m a mathematical physicist who studies the combined GR & SR of Albert Einstein Complete Non -Reducible rewritten in 4D-Spacetime (& CAP-dual 4D-Momentumenergy), i.e. without the incorrectly used higher-dimensional Riemannian manifolds of Albert Einstein himself! This at-once only results into the following conserved spin-values of elem. particles: s (still to be multiplied by h-bar) can ONLY be one of the following values: {1/2, 1, 3/2, 2}!! Please also visit my website: Describing conserved spin in the direction-of-motion math. explicitly CN explains why QM must always be solved in the infinite dimensional Complex Hilbert-space! ©