When the integer $ {\left(\sqrt{3} \plus{} 5\right)}^{103} \minus{} {\left(\sqrt{3} \minus{} 5\right)}^{103}$ is divided by 9, what is the remainder?
1. Let \( a_n = (\sqrt{3} + 5)^n + (\sqrt{3} - 5)^n \). Notice that \( a_n \) is an integer because the irrational parts cancel out.
2. We need to find the remainder when \( (\sqrt{3} + 5)^{103} - (\sqrt{3} - 5)^{103} \) is divided by 9. Define \( b_n = (\sqrt{3} + 5)^n - (\sqrt{3} - 5)^n \). We are interested in \( b_{103} \mod 9 \).
3. Observe that \( b_n \) satisfies a linear recurrence relation. We can derive this by considering the binomial expansions of \( (\sqrt{3} + 5)^n \) and \( (\sqrt{3} - 5)^n \).
4. Notice that \( b_n \) is always an integer because the irrational parts cancel out.
5. We need to find a recurrence relation for \( b_n \). From the properties of binomial expansions, we can derive:
   \[
   b_{n+2} = 2 \cdot 5 \cdot b_{n+1} + (5^2 - 3) \cdot b_n = 10 b_{n+1} + 22 b_n
   \]
6. We need to find the values of \( b_n \mod 9 \). Let's compute the first few terms:
   \[
   b_0 = 0, \quad b_1 = 2 \cdot 5 = 10 \equiv 1 \mod 9
   \]
   \[
   b_2 = 10 b_1 + 22 b_0 = 10 \cdot 1 + 22 \cdot 0 = 10 \equiv 1 \mod 9
   \]
   \[
   b_3 = 10 b_2 + 22 b_1 = 10 \cdot 1 + 22 \cdot 1 = 32 \equiv 5 \mod 9
   \]
   \[
   b_4 = 10 b_3 + 22 b_2 = 10 \cdot 5 + 22 \cdot 1 = 72 \equiv 0 \mod 9
   \]
   \[
   b_5 = 10 b_4 + 22 b_3 = 10 \cdot 0 + 22 \cdot 5 = 110 \equiv 2 \mod 9
   \]
   \[
   b_6 = 10 b_5 + 22 b_4 = 10 \cdot 2 + 22 \cdot 0 = 20 \equiv 2 \mod 9
   \]
7. We observe that \( b_n \mod 9 \) has a periodicity. The sequence \( b_n \mod 9 \) repeats every 6 terms: \( 1, 1, 5, 0, 2, 2 \).
8. Since \( 103 \equiv 1 \mod 6 \), we have \( b_{103} \equiv b_1 \mod 9 \).
9. From our earlier calculations, \( b_1 \equiv 1 \mod 9 \).

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