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On polynomials of the form $$x^{r}f(x^{(q - 1)/l})$$. (English) Zbl 1135.11341
Summary: We give a general criterion for permutation polynomials of the form $$x^r f(x^{(q-1)/\ell})$$, where $$r\geq 1$$, $$\ell \geq 1$$ and $$l | (q-1)$$. We employ this criterion to characterize several classes of permutation polynomials.

##### MSC:
 11T06 Polynomials over finite fields
Full Text:
##### References:
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