RSolve question

*To*: mathgroup at smc.vnet.net*Subject*: [mg5524] RSolve question*From*: daiyanh at mindspring.com (Daitaro Hagihara)*Date*: Sat, 14 Dec 1996 19:26:16 -0500*Sender*: owner-wri-mathgroup at wolfram.com

To the List: I appreciate if you can give me some input into the following math questions that puzzle me quite a bit: 1) Why am I getting the following error? This example came from Wolfram Koepf's PowerSeries`. You don't need this package here. In[2]:= RSolve[{ k*(1 + k)*a[k] + (1 + k)*(2 + k)*a[2 + k] == 0, a[0]==0, a[1]==1}, a[k], k] DSolve::dnim: Built-in procedures cannot solve this differential equation. DSolve::dnim: Built-in procedures cannot solve this differential equation. Out[2]= RSolve[{k (1 + k) a[k] + (1 + k) (2 + k) a[2 + k] == 0, a[0] == 0, a[1] == 1}, a[k], k] TX in advance Daitaro Hagihara