Let $(a_n)_{n \ge 1}$ be a sequence of positive real numbers such that the sequence $(a_{n+1}-a_n)_{n \ge 1}$ is convergent to a non-zero real number. Evaluate the limit $$ \lim_{n \to \infty} \left( \frac{a_{n+1}}{a_n} \right)^n.$$
1. Given that the sequence \((a_n)_{n \ge 1}\) is a sequence of positive real numbers and the sequence \((a_{n+1} - a_n)_{n \ge 1}\) converges to a non-zero real number \(a\), we start by noting that:
   \[
   \lim_{n \to \infty} (a_{n+1} - a_n) = a \quad \text{with} \quad a \neq 0.
   \]
   Since \(a\) is non-zero and positive, we can assume \(a > 0\) without loss of generality.

2. For any \(\epsilon > 0\), there exists a natural number \(N\) such that for all \(n \ge N\):
   \[
   (1 - \epsilon)a < a_{n+1} - a_n < (1 + \epsilon)a.
   \]

3. We can rewrite the inequality in terms of the ratio \(\frac{a_{n+1}}{a_n}\):
   \[
   1 + \frac{(1 - \epsilon)a}{a_n} < \frac{a_{n+1}}{a_n} < 1 + \frac{(1 + \epsilon)a}{a_n}.
   \]

4. For large \(n\), since \(a_n\) is positive and increasing, we can approximate \(a_n\) by \(na\) (as \(a_n\) grows linearly with \(n\)). Thus, for large \(n\):
   \[
   1 + \frac{(1 - \epsilon)a}{na} < \frac{a_{n+1}}{a_n} < 1 + \frac{(1 + \epsilon)a}{na}.
   \]
   Simplifying the fractions, we get:
   \[
   1 + \frac{1 - \epsilon}{n} < \frac{a_{n+1}}{a_n} < 1 + \frac{1 + \epsilon}{n}.
   \]

5. Taking the \(n\)-th power of the inequalities, we have:
   \[
   \left(1 + \frac{1 - \epsilon}{n}\right)^n < \left(\frac{a_{n+1}}{a_n}\right)^n < \left(1 + \frac{1 + \epsilon}{n}\right)^n.
   \]

6. As \(n \to \infty\), we use the limit property of the exponential function:
   \[
   \lim_{n \to \infty} \left(1 + \frac{1 - \epsilon}{n}\right)^n = e^{1 - \epsilon} \quad \text{and} \quad \lim_{n \to \infty} \left(1 + \frac{1 + \epsilon}{n}\right)^n = e^{1 + \epsilon}.
   \]

7. By the Squeeze Theorem, we get:
   \[
   e^{1 - \epsilon} < \lim_{n \to \infty} \left(\frac{a_{n+1}}{a_n}\right)^n < e^{1 + \epsilon}.
   \]

8. Since \(\epsilon\) is arbitrary and can be made as small as desired, we conclude:
   \[
   \lim_{n \to \infty} \left(\frac{a_{n+1}}{a_n}\right)^n = e.
   \]

The final answer is \(\boxed{e}\).