# Equivalent

• Jul 13th 2010, 12:56 PM
joaopa
Equivalent
Hi everybody,

Any idea to solve this problem: One denotes $\mathbb N=\{0,1,\cdots\}$.

Let $(L_n)_{n\in\mathbb N}$ be a positive non-decreasing sequence such that $L_n\underset{n\to+\infty}{\sim}q^n$ with $q>0$.

Then, for every $n\in\mathbb{N}$
$\sum_{\substack{u_1+\cdots+u_{n+1}=j-n\\u_1\ge0,\cdots,u_{n+1}\ge0}}\limits L_{u_1}L_{u_2}\cdots L_{u_{n+1}}\underset{j\to+\infty}{\sim}L_j\binom{j }{n}.$