Re: Polylog equations
- To: mathgroup at smc.vnet.net
- Subject: [mg85000] Re: Polylog equations
- From: "David W.Cantrell" <DWCantrell at sigmaxi.net>
- Date: Tue, 22 Jan 2008 01:57:38 -0500 (EST)
- References: <fn21oa$in5$1@smc.vnet.net>
Valeri Astanoff <astanoff at gmail.com> wrote:
> Good day,
>
> Given these polylog equations:
>
> In[1]:= Assuming[0 < x < 1,
> Solve[PolyLog[3/2,x]==y && PolyLog[5/2,x]==z,z,x]]
>
> Out[1]= {{}}
>
> what is the best way to get z(y)?
I hope this is not the best way, but it's all that came to mind:
z(y) is given by
PolyLog[5/2, x /. FindRoot[PolyLog[3/2, x] == y, {x, 1/2}]]
David