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Approximation theory is concerned with how functions can best be approximated with simpler functions, and with quantitatively characterizing the errors introduced thereby.

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Asymptotics for the number of digits of the ratio of binomial coefficients

This is only a partial solution. Write $\log(a_{n}^n)=n\log(a_{n})+\sum_{i=1}^{n-1}\log(1+\frac{i}{a_{n}})$. For the first term, we have $\log(a_{n})=\log(a)+\log(n)+o(1)$. For the second term, we h …
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