Parity considerations in the expansion of Fermat-Pell polynomials
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Parity considerations in the expansion of Fermat-Pell polynomials
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| Id. |
20814361 |
| Titulo |
Parity considerations in the expansion of Fermat-Pell polynomials |
| Autor(es) |
Laughlin, James Mc |
| Localización |
http://arxiv.org/abs/math/0001190
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| Versión |
1.0 |
| Estado |
Final
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| Descripción |
For each positive integer $n$ it is shown how to construct a finite
collection of multivariable polynomials $\{F_{i}:=F_{i}(t,X_{1},..., X_{\lfloor
\frac{n+1}{2} \rfloor})\}$ such that each positive integer whose squareroot has
a continued fraction expansion with period $n+1$ lies in the range of exactly
one of these polynomials. Moreover, each of these polynomials satisfy a
polynomial Pell's equation $C_{i}^{2} -F_{i}H_{i}^{2} = (-1)^{n-1}$ (where
$C_{i}$ and $H_{i}$ are polynomials in the variables $t,X_{1},..., X_{\lfloor
\frac{n+1}{2} \rfloor}$) and the fundamental solution can be written down.
Likewise, if all the $X_{i}$'s and $t$ are non-negative then the continued
fraction expansion of $\sqrt{F_{i}}$ can be written down. Furthermore, the
congruence class modulo 4 of $F_{i}$ depends in a simple way on the variables
$t,X_{1},..., X_{\lfloor \frac{n+1}{2} \rfloor}$ so that the fundamental unit
can be written down for a large class of real quadratic fields.
Along the way a complete solution is given to the problem of determining for
which symmetric strings of positive integers $a_{1},..., a_{n}$ do there exist
positive integers $D$ and $a_{0}$ such that $\sqrt{D} = [ a_{0};\bar{a_{1},
>..., a_{n},2a_{0}}]$. |
| Palabras clave |
Mathematics - Number Theory |
| Tipo de recurso |
Texto Narrativo
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| Tipo de Interactividad |
Expositivo
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| Nivel de Interactividad |
muy bajo
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| Audiencia |
Estudiante
Profesor
Autor
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| Estructura |
Atomic |
| Coste |
no
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| Copyright |
sí
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| Requerimientos técnicos |
Browser: Any |
| Fecha de contribución |
26-mar-2007 |
| Contacto |
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