Standard library Factorial missing

Unity Engine
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1

I found that in the .NET Framework there is the function BigInteger.Factorial Method

But I can’t use it from Unity!

Although I think they are standard functions, I have not found any other functions useful for combinatorics such as combinations.

I am able to write these functions, but I am sure the program would be faster using library functions!

Is it possible that there are no standard libraries?

2

BigInteger is in C#, and seems to compile fine in Unity. It does not have a Factorial method, though. But I googled the class and Factorial is not a method in the standard .NET Framework, according to the docs. Where did you “find” it?

If you found reference to it in some code somewhere, that code might have had an extension method somewhere.