Abstract
This paper deals with reduction of the four-dimensional harmonic oscillator by use of a one-parameter subgroup U(1) of the symmetry group SU(4), U(1) being the symmetry subgroup generated by an ’’angular momentum.’’ The angular momentum determines in the energy surface S7 an ’’energy-momentum’’ manifold S3×S3 on which a subgroup SU(2)×SU(2) of SU(4) acts. The reduction process yields a manifold S3×S2 = S3×S3/U(1) on which SO(4) acts effectively.

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