Discrete Mathematics – General Process for Solving First Order Recurrence Relations

discrete mathematicsrecurrence-relations

So I had asked a question prior to this one about recurrence relations, but apparently it was a bad one to ask. So I'm trying again to understand how to solve these babies… Here it is:

$$
3a_{n+1}-4a_n=0, n>=0, a_1=5
$$

What is the general process for solving a relation like this?

Best Answer

When you only have two terms, it just becomes a power law like the last one. In this case you get $a_n=\left(\frac34\right)^na_0$

Probably you are looking for relations with three terms, like the Fibonacci one: $F_{n+1}=F_n+F_{n-1}$ You might look at Wikipedia

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