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The analytical relations in position, momentum and four-dimensional spacesare established for the expansion and one-range addition theorems ofrelativistic complete orthonormal sets of exponential type spinor wavefunctions and Slater spinor orbitals of arbitrary half-integral spin. Thesetheorems are expressed through the corresponding nonrelativistic expansion andone-range addition theorems of the spin-0 particles introduced by the author.The expansion and one-range addition theorems derived are especially useful forthe computation of multicenter integrals over exponential type spinor orbitalsarising in the generalized relativistic Dirac-Hartree-Fock-Roothaan theory whenthe position, momentum and four-dimensional spaces are employed.

Expansion and one-range addition theorems for complete orthonormal sets  of spinor wave functions and Slater spinor orbitals of arbitrary  half-integral spin in position, momentum and four-dimensional spaces