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On approximate polynomials with integral coefficients only. - MaRDI portal

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On approximate polynomials with integral coefficients only. (Q1460296)

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scientific article; zbMATH DE number 2598195
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English
On approximate polynomials with integral coefficients only.
scientific article; zbMATH DE number 2598195

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    On approximate polynomials with integral coefficients only. (English)
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    1923
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    Es wird folgender Satz bewiesen: es sei \(0 < a < 2\), \(Q(x)\) sei ein Polynom mit ganzzahligen Koeffizienten, das der Bedingung \[ |Q(x)| < 1 \text{ für } - a \leqq x \leqq a \] genügt; \(f(x)\) sei eine stetige Funktion, die an jeder Nullstelle von \(Q(x)\) im Intervall \((-a, a)\) gleichfalls verschwindet; dann ist \(f(x)\) in diesem Intervall durch Polynome mit ganzzahligen Koeffizienten gleichmäßig approximierbar. Nach einem Satz von Kakeya, den Okada mitteilt, gibt es zu jedem \(a\) ein derartiges Polynom \(Q(x)\). Für spezielle \(Q(x)\) ergibt sich ein Satz von Pál und ein Satz von Kakeya (F. d. M. 45, 634 (JFM 45.0634.*), 1914-15).
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