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View Thread: Nicely done, Channel 9 (posted by Dr Herbie).
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    Charles said:
    brianbec said:

    How does WolframAlpha get to 9 so fast?

    They analyze the formula symbolically, look it up, and "know" it's factorial in disguise. They have a huge internal database of series and products -- tens of thousands.


    (I was at Caltech when Wolfram started up the Mathematica project circa 1979 (it was called SMP, then) -- they've been keyboarding in mathematical knowledge for 30+ years, now; that's how they got such a huge body of info)