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tsuwal
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Homework Statement
Homework Equations
The Attempt at a Solution
Do I need to used the boring Stirling formula?
tsuwal said:Homework Statement
View attachment 56798
Homework Equations
The Attempt at a Solution
Do I need to used the boring Stirling formula?
tt2348 said:Actually, i think this problem can be done without stirrings. For the top factorial, you have (2n-2) terms, giving a leading term of (2n)^(2n-2) for the expansion. Then the bottom will have (n^(n-2)+...)(n^n+...), giving a leading coefficient n^(2n-2)... This your limit becomes (2n-2)!/(2^(2n-2)*n!*n-2!)~O(2^(2n-2)*n^(2n-2)/(2^(2n-2)*n^(2n-2))~1
tsuwal said:I don't use the stirling formula because it is just a aproximation and I'm not sure if I can substitute n! by n^n/e^n
In fact, wolfram alpha says the limit of n!*e^n/n^n as n goes to infinity is not 1, is infinity, so it is not a good aproximation, right?
tsuwal said:Now it makes sense. I didn't knew "that" stirling formula, mine is deduced from the numerical integration of the logarithmic function by ln(n!). Would like to know how do you get to your formula though.. Thanks!
The Horrible Limit with Factorials refers to a mathematical expression that involves taking the limit of a sequence of numbers as the factorial of those numbers grows larger.
Stirling's Formula is a mathematical approximation that can be used to simplify the calculation of factorial expressions. It is particularly useful when dealing with large factorials, as it provides a more manageable and accurate result compared to directly calculating the factorial.
Stirling's Formula is based on the logarithmic approximation of factorials and is derived from the Gamma function, which is a continuous extension of the factorial function. It uses the natural logarithm to simplify the calculation of factorials and provides an asymptotic expansion for the factorial function.
Stirling's Formula is an approximation and not an exact solution, so there will always be some degree of error when using it. This error tends to increase as the value of the factorial becomes larger. Additionally, Stirling's Formula may not work for all types of factorial expressions and may require additional adjustments to be accurate.
The Horrible Limit with Factorials can be used in various fields of science, such as statistics, physics, and engineering, to analyze and predict the behavior of large numbers. It is often used to estimate the growth rate of a sequence or to determine the asymptotic behavior of a particular function. It can also be applied in the study of algorithms and computational complexity.