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 online help and wolfram website | 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]}} | |