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POLYNOMIAL VALUES IN SUBFIELDS AND AFFINE SUBSPACES OF FINITE FIELDS

POLYNOMIAL VALUES IN SUBFIELDS AND AFFINE SUBSPACES OF FINITE FIELDS

For an integer |$r$|⁠, a prime power |$q$| and a polynomial |$f$| over a finite field |${{\mathbb F}}_{q^r}$| of |$q^r$| elements, we obtain an upper bound on the frequency of elements in an orbit generated by iterations of |$f$| which fall in a proper subfield of |${{\mathbb F}}_{q^r}$|⁠. We also …