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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Number+Theory 2014 ; 137 (ä): 241-55 Nephropedia Template TP
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Integral-valued polynomials over sets of algebraic integers of bounded degree? #MMPMID26949270
Peruginelli G
J Number Theory 2014[Apr]; 137 (ä): 241-55 PMID26949270show ga
Let K be a number field of degree n with ring of integers OK. By means of a criterion of Gilmer for polynomially dense subsets of the ring of integers of a number field, we show that, if h?K[X] maps every element of OK of degree n to an algebraic integer, then h(X) is integral-valued over OK, that is, h(OK)?OK. A similar property holds if we consider the set of all algebraic integers of degree n and a polynomial f?Q[X]: if f(?) is integral over Z for every algebraic integer ? of degree n, then f(?) is integral over Z for every algebraic integer ? of degree smaller than n. This second result is established by proving that the integral closure of the ring of polynomials in Q[X] which are integer-valued over the set of matrices Mn(Z) is equal to the ring of integral-valued polynomials over the set of algebraic integers of degree equal to n.