Re: Trouble with double factorial and an infinite product

• To: mathgroup at smc.vnet.net
• Subject: [mg84381] Re: Trouble with double factorial and an infinite product
• From: "C.O." <costerhoudt at gmail.com>
• Date: Thu, 20 Dec 2007 00:18:51 -0500 (EST)
• References: <fkaoir\$du9\$1@smc.vnet.net>

```Confirmed here on

\$Version

"6.0 for Microsoft Windows (32-bit) (April 20, 2007)"

Visual Studio quickly offers to do a stack trace, with a message
of
"Unhandled exception at 0x648c3ebb in MathKernel.exe: 0xC0000005:
Access violation reading location 0x01d2e512." Whatever THAT means.

The same product with just 1/n!! returns zero (correct), and
Product[1 + 1/n!, {n, Infinity}]
returns unevaluated.

On Dec 19, 2:34 am, giovanni resta <g.resta... at CUTiit.cnr.it> wrote:
> A collegue of mine says that evaluating this
>
> Product[1+1/n!!,{n,Infinity}]
>
> quickly kills the kernel in Mathematica 6.
> (but the same with {n,2,Infinity} does not)
>
> (The symbol n!! denotes the "double factorial" not
> the repeated application of factorial, n!!=n(n-2)(n-4)... (1 or 2).)
>
> In previous versions it seems to me that it simply
> returns it unevaluated.
>
> I'm just curious to know if it is a problem in his installation
> or a little bug.
> giovanni

```

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