Re: what is K\$

• To: mathgroup at smc.vnet.net
• Subject: [mg66497] Re: what is K\$
• From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
• Date: Wed, 17 May 2006 03:29:31 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```Hi,

sometimes one need a auxilary variable, that has no meaning because it
is used as integration variable or as summation index.  But Mathematica
can't perform the integration or summation.  When Mathematica needs such
a variable it names it <letter>\$<number> and this is what you see.

Regards
Jens

"na" <na at na.na.com> schrieb im Newsbeitrag
news:e4bian\$155\$1 at smc.vnet.net...
| Sometimes, when I try to evaluate something I
get a K\$ followed by some
| number, what is this K\$ ?  I Searched entire
| and I couldn't find anything on this K\$.  Here
is an example:
| In[5]:=
| DSolve[Derivative[1][f][x]*
| Derivative[1][g][x] ==
| D[f[x]*g[x], x], f[x], x]
|
|
| Out[5]=
| {{f[x] -> E^Integrate[
| -(Derivative[1][g][
| K\$74]/(g[K\$74] -
| Derivative[1][g][
| K\$74])), {K\$74, 1,
| x}]*C[1]}}
|
|

```

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