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.

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