An Additional Apostrophe

Calculus Level 1

lim x 0 x x ! = ? \Large \lim_{x\to0} \dfrac{x}{x!} = \, ?

Note: Treat x ! = Γ ( x + 1 ) x! = \Gamma(x+1) .


The answer is 0.

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3 solutions

William Crabbe
Apr 27, 2018

= lim x 0 1 Γ ( x ) \large = \lim_{x\to0} \dfrac{1}{\Gamma(x)} Because lim x 0 Γ ( x ) = \lim_{x\to0} \Gamma(x) = \infty , we get
lim x 0 1 Γ ( x ) = 1 = 0 \lim_{x\to0} \dfrac{1}{\Gamma(x)} = \frac{1}{\infty} = \boxed{0}

Jesse Nieminen
Apr 16, 2018

If we define x ! : = Γ ( x + 1 ) x! := \Gamma\left(x+1\right) , then by definition of continuity, lim x 0 x x ! = 0 1 = 0 \lim\limits_{x \to 0} \dfrac{x}{x!} = \dfrac{0}{1} = 0 ,
because f ( x ) = x f\left(x\right) = x and g ( x ) = x ! g\left(x\right) = x! are continuous at every x C x \in \mathbb{C} meaning that f ( x ) g ( x ) \dfrac{f\left(x\right)}{g\left(x\right)} is continuous at every x C x \in \mathbb{C} such that g ( x ) 0 g\left(x\right) \neq 0 .

Hence, the answer is 0 \boxed{0} .

But what is tau function?

Ankush Kumar - 5 months, 1 week ago
Jiro Kun
Jun 15, 2021

Since x! = 0 and 0/1 is equal to zero, we can say that this limit equal to 0 by implementing "0" in expression.

P. S. I'm not good in formatting text, especially math symbols, so I hope you understand my explanation

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