Complex Gamma? - 3

Calculus Level 4

Γ ( π ! ) = ? \huge {\Gamma (\pi !) = ?}


Please share a method to solve this. I couldn't solve and checked the answer using Wolfram Alpha.


The answer is 1026.776.

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1 solution

Michael Mendrin
Mar 6, 2016

This is the same as Γ ( Γ ( π + 1 \Gamma(\Gamma(\pi+1 ))

We can use the series approximation of the gamma function, twice

Γ ( z ) = e z z z 2 π z ( 1 + 1 12 z + 1 288 z 2 139 51840 z 3 . . . ) \Gamma \left( z \right) ={ e }^{ -z }{ z }^{ z }\sqrt { \frac { 2\pi }{ z } } \left( 1+\frac { 1 }{ 12z } +\frac { 1 }{ 288{ z }^{ 2 } } -\frac { 139 }{ 51840{ z }^{ 3 } } -... \right)

which will yield 1026.7787... 1026.7787... which is accurate to two decimal places.

The constant π \pi might as well be any random irrational number insofar as computing the Gamma Function value of it. There are special numbers for which the Gamma Function has expressible values, but π \pi is not one of them.

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