The sequence $ (F_n)$ of Fibonacci numbers satisfies $ F_1 \equal{} 1, F_2 \equal{} 1$ and $ F_n \equal{} F_{n\minus{}1} \plus{}F_{n\minus{}2}$ for all $ n \ge 3$. Find all pairs of positive integers $ (m, n)$, such that $ F_m . F_n \equal{} mn$.
To solve the problem, we need to find all pairs of positive integers \((m, n)\) such that \(F_m \cdot F_n = mn\), where \(F_n\) is the \(n\)-th Fibonacci number.

1. **Establishing the Fibonacci Sequence:**
   The Fibonacci sequence is defined as:
   \[
   F_1 = 1, \quad F_2 = 1, \quad \text{and} \quad F_n = F_{n-1} + F_{n-2} \quad \text{for all} \quad n \geq 3.
   \]

2. **Analyzing the Growth of Fibonacci Numbers:**
   We need to understand the growth of Fibonacci numbers. It is known that for \(n > 5\), \(F_n > n\), and for \(n > 7\), \(F_n > 2n\). We will prove these statements by induction.

3. **Proof by Induction:**
   - **Base Case:**
     For \(n = 6\), \(F_6 = 8\) and \(6 < 8\), so \(F_6 > 6\).
     For \(n = 8\), \(F_8 = 21\) and \(2 \cdot 8 = 16 < 21\), so \(F_8 > 2 \cdot 8\).

   - **Inductive Step:**
     Assume \(F_k > k\) for \(k \leq n\). We need to show \(F_{n+1} > n+1\).
     \[
     F_{n+1} = F_n + F_{n-1}
     \]
     By the inductive hypothesis, \(F_n > n\) and \(F_{n-1} > n-1\).
     \[
     F_{n+1} = F_n + F_{n-1} > n + (n-1) = 2n - 1 > n+1 \quad \text{for} \quad n \geq 2.
     \]
     Thus, \(F_{n+1} > n+1\).

     Similarly, for \(F_n > 2n\) for \(n > 7\), we can use the same inductive approach.

4. **Checking Small Values:**
   We now check the values of \(n \leq 5\) to find pairs \((m, n)\) such that \(F_m \cdot F_n = mn\).

   - For \(n = 1\):
     \[
     F_1 \cdot F_m = 1 \cdot F_m = m \quad \Rightarrow \quad F_m = m.
     \]
     The only solution is \(m = 1\).

   - For \(n = 2\):
     \[
     F_2 \cdot F_m = 1 \cdot F_m = 2m \quad \Rightarrow \quad F_m = 2m.
     \]
     There is no solution since \(F_m > 2m\) for \(m > 7\).

   - For \(n = 3\):
     \[
     F_3 \cdot F_m = 2 \cdot F_m = 3m \quad \Rightarrow \quad F_m = \frac{3m}{2}.
     \]
     There is no solution since \(F_m > 2m\) for \(m > 7\).

   - For \(n = 4\):
     \[
     F_4 \cdot F_m = 3 \cdot F_m = 4m \quad \Rightarrow \quad F_m = \frac{4m}{3}.
     \]
     There is no solution since \(F_m > 2m\) for \(m > 7\).

   - For \(n = 5\):
     \[
     F_5 \cdot F_m = 5 \cdot F_m = 5m \quad \Rightarrow \quad F_m = m.
     \]
     The only solution is \(m = 5\).

5. **Conclusion:**
   The only pairs \((m, n)\) that satisfy \(F_m \cdot F_n = mn\) are \((1, 1)\) and \((5, 5)\).

The final answer is \( \boxed{ (1, 1) } \) and \((5, 5)\).