Finite Fields and Appl. 1 (1995) 437-439 [MR 96i:11133, Zb 839.11064]

#
When Are Weak Permutation Polynomials Strong?

Abstract:
For a commutative finite ring with identity R, the two definitions
of "permutation polynomial in several indeterminates over R"
coincide if and only if R is a direct sum of finite fields.
1991 Mathematics Subject Classification: 11T06, 13M10;
Secondary: 13B25.

PDF: S. Frisch: When are weak permutation polynomials strong?

DVI: S. Frisch: When are weak permutation polynomials strong? (dvi)

PS: S. Frisch: When are weak permutation polynomials strong? (PostScript)