       Re: Mathematica:recursion with 2 arguments?

• To: mathgroup at smc.vnet.net
• Subject: [mg64422] Re: Mathematica:recursion with 2 arguments?
• From: Renan <renan.birck at gmail.com>
• Date: Thu, 16 Feb 2006 03:05:38 -0500 (EST)
• References: <200602130815.DAA12589@smc.vnet.net> <dsuqik\$70n\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Pratik Desai escreveu no grupo comp.soft-sys.math.mathematica:
> ddjjjkkkk wrote:
>
> >Hi,everybody:
> >My English is a little poor.But I have a very flustered problem to consult you.Who can help me? Here is the prob:
> >IF function f(m,n)(m,n are non-negative integers)satisfying 3 conditions:
> > f(0,n)=n+1,f(m+1,0)=f(m,1) and f(m+1,n+1)=f[m,f(m+1,n)],then how can
> > we use Wolfram's Mathematica to solve f(m,1),f(m,2),f(m,3) and so on.
> > I can get f(1,n)=n+2,f(2,n)=n+3,f(3,n)=2^(n+3)-3 by hand and pen(but how by Mathematica?).
> > Surely,f(4,n) is very complicated.
> >Who can use Mathematica's language (recursion or iteration etc.) to solve them out? Friends,help me--a poor person,please!!!!!!
> >
> >
> Have you tried RSolve???

RSolve doesn't seem to like it:

In := RSolve[{f[0, n] == n + 1, f[m + 1, 0] == f[m, 1],
f[m + 1, n + 1] == f[m, f[m + 1, n]]}, f, {m, n}]

RSolve::nestdv : The expression f[1+m,n] has nested dependent variables.

\$Version is "5.2 for Microsoft Windows (June 20, 2005)"

```

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