Discrete Mathematics
Finite fields
Check character systems and anti-symmetric mappings
Computational Discrete Mathematics
Complete Mapping Polynomials over Finite Field F16
WAIFI '07 Proceedings of the 1st international workshop on Arithmetic of Finite Fields
Generalizations of complete mappings of finite fields and some applications
Journal of Symbolic Computation
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Let q be a prime power. For a divisor n of q 驴 1 we prove an asymptotic formula for the number of polynomials of the form $$f(X)=\frac{a-b}{n}\left(\sum_{j=1}^{n-1}X^{j(q-1)/n}\right)X+\frac{a+b(n-1)}{n}X\in\mathbb{F}_q[X]$$ such that the five (not necessarily different) polynomials f(X), f(X)卤X and f(f(X))卤X are all permutation polynomials over $${\mathbb{F}_q}$$ . Such polynomials can be used to define check digit systems that detect the most frequent errors: single errors, adjacent transpositions, jump transpositions, twin errors and jump twin errors.