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We give explicit expressions for the three-quark exchange operators, crossingmatrices and Fierz transforms for the SU(2) and SU(3) groups. We identify theinvariant terms in these operators and express them in terms of Casimiroperators.Comment: 8 pages, RevTex, to appear in Jour. Math. Phy

Erratum: Three-quark exchange operators, crossing matrices and Fierz transformations in SU(2) and SU(3) [J. Math. Phys. 42, 991 (2001)]