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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