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Two theorems about a certain expansion of numbers in infinite products. - MaRDI portal

Two theorems about a certain expansion of numbers in infinite products. (Q1564458)

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scientific article; zbMATH DE number 2721114
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Two theorems about a certain expansion of numbers in infinite products.
scientific article; zbMATH DE number 2721114

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    Two theorems about a certain expansion of numbers in infinite products. (English)
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    1869
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    Die Sätze lauten: 1. Man kann eine jede Zahlengrösse \(A>1\) auf eine und nur eine Weise darstellen als Product \(A=(1+\frac{1}{a}) \; (1+\frac{1}{b}) \; (1+\frac{1}{c})\cdot\cdot,\) wo \(a,b,c,..\) ganze Zahlen sind, so beschaffen, dass \(b\geqq a^{2}, c\geqq b^{2},..\) 2. Ist A eine rationale Zahl \(\frac{p}{q}\), so hat die unter 1. \; nachgewiesene Entwickelung von \(A\) nothwendig die specielle Form \[ A=\left(1+\frac{1}{a}\right) \cdot \cdot \left(1+\frac{1}{i}\right) \left(1+\frac{1}{k}\right) \left(1+\frac{1}{k^{2}} \right) \cdot\cdot \left(1+ \frac{1}{t^{2\lambda}} \right). \] Aus 2. folgt z. B., dass \(\left(1+\frac{1}{a-1} \right) \left(1+\frac{1}{a^2-1}\right) \left(1+\frac{1}{a^4-1}\right)\cdot\cdot\) irrational ist.
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    Product representation of numbers
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