Let $(a_n)_{n\in\mathbb N}$ be a sequence, given by the recurrence:
$$ma_{n+1}+(m-2)a_n-a_{n-1}=0$$
where $m\in\mathbb R$ is a parameter and the first two terms of $a_n$ are fixed known real numbers. Find $m\in\mathbb R$, so that
$$\lim_{n\to\infty}a_n=0$$

[i]Proposed by Laurențiu Modan[/i]
1. Given the recurrence relation:
   \[
   ma_{n+1} + (m-2)a_n - a_{n-1} = 0
   \]
   we assume a solution of the form \(a_n = r^n\). Substituting \(a_n = r^n\) into the recurrence relation, we get:
   \[
   m r^{n+1} + (m-2) r^n - r^{n-1} = 0
   \]
   Dividing through by \(r^{n-1}\), we obtain the characteristic equation:
   \[
   m r^2 + (m-2) r - 1 = 0
   \]

2. Solving the characteristic equation \(m r^2 + (m-2) r - 1 = 0\) using the quadratic formula \(r = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\), where \(a = m\), \(b = m-2\), and \(c = -1\), we get:
   \[
   r = \frac{-(m-2) \pm \sqrt{(m-2)^2 - 4m(-1)}}{2m}
   \]
   Simplifying inside the square root:
   \[
   r = \frac{-(m-2) \pm \sqrt{m^2 - 4m + 4 + 4m}}{2m} = \frac{-(m-2) \pm \sqrt{m^2 + 4}}{2m}
   \]
   Thus, the roots are:
   \[
   r_{1,2} = \frac{-m+2 \pm \sqrt{m^2 + 4}}{2m}
   \]

3. The general solution to the recurrence relation is:
   \[
   a_n = A \left( \frac{-m+2+\sqrt{m^2+4}}{2m} \right)^n + B \left( \frac{-m+2-\sqrt{m^2+4}}{2m} \right)^n
   \]
   where \(A\) and \(B\) are constants determined by the initial conditions.

4. For \(\lim_{n \to \infty} a_n = 0\), both roots must have absolute values less than 1. We need to analyze the roots:
   \[
   r_1 = \frac{-m+2+\sqrt{m^2+4}}{2m}, \quad r_2 = \frac{-m+2-\sqrt{m^2+4}}{2m}
   \]

5. Consider the root \(r_1\):
   \[
   \left| \frac{-m+2+\sqrt{m^2+4}}{2m} \right| < 1
   \]
   This inequality must hold for the root to be less than 1 in absolute value. Similarly, for \(r_2\):
   \[
   \left| \frac{-m+2-\sqrt{m^2+4}}{2m} \right| < 1
   \]

6. To ensure both roots have absolute values less than 1, we need to find the range of \(m\) that satisfies these conditions. By analyzing the behavior of the roots, we find that:
   \[
   m > 2
   \]
   ensures that both roots are within the unit circle in the complex plane.

The final answer is \( \boxed{ m > 2 } \)