Consider the sequence $ a_1\equal{}\frac{3}{2}, a_{n\plus{}1}\equal{}\frac{3a_n^2\plus{}4a_n\minus{}3}{4a_n^2}.$
$ (a)$ Prove that $ 1<a_n$ and $ a_{n\plus{}1}<a_n$ for all $ n$.
$ (b)$ From $ (a)$ it follows that $ \displaystyle\lim_{n\to\infty}a_n$ exists. Find this limit.
$ (c)$ Determine $ \displaystyle\lim_{n\to\infty}a_1a_2a_3...a_n$.
1. **Prove that \(1 < a_n < 3\) for all positive integers \(n\)**:
   - **Base Case**: For \(n = 1\), we have \(a_1 = \frac{3}{2}\). Clearly, \(1 < \frac{3}{2} < 3\).
   - **Inductive Step**: Assume \(1 < a_n < 3\) for some \(n\). We need to show that \(1 < a_{n+1} < 3\).

     - **Prove \(a_{n+1} > 1\)**:
       \[
       a_{n+1} = \frac{3a_n^2 + 4a_n - 3}{4a_n^2}
       \]
       We need to show:
       \[
       \frac{3a_n^2 + 4a_n - 3}{4a_n^2} > 1
       \]
       This simplifies to:
       \[
       3a_n^2 + 4a_n - 3 > 4a_n^2
       \]
       \[
       3a_n^2 + 4a_n - 3 - 4a_n^2 > 0
       \]
       \[
       -a_n^2 + 4a_n - 3 > 0
       \]
       \[
       a_n^2 - 4a_n + 3 < 0
       \]
       Factoring the quadratic inequality:
       \[
       (a_n - 1)(a_n - 3) < 0
       \]
       Since \(1 < a_n < 3\), the product \((a_n - 1)(a_n - 3)\) is negative, confirming \(a_{n+1} > 1\).

     - **Prove \(a_{n+1} < 3\)**:
       \[
       a_{n+1} = \frac{3a_n^2 + 4a_n - 3}{4a_n^2}
       \]
       We need to show:
       \[
       \frac{3a_n^2 + 4a_n - 3}{4a_n^2} < 3
       \]
       This simplifies to:
       \[
       3a_n^2 + 4a_n - 3 < 12a_n^2
       \]
       \[
       3a_n^2 + 4a_n - 3 - 12a_n^2 < 0
       \]
       \[
       -9a_n^2 + 4a_n - 3 < 0
       \]
       \[
       9a_n^2 - 4a_n + 3 > 0
       \]
       The discriminant of the quadratic \(9a_n^2 - 4a_n + 3\) is:
       \[
       \Delta = (-4)^2 - 4 \cdot 9 \cdot 3 = 16 - 108 = -92
       \]
       Since the discriminant is negative, the quadratic \(9a_n^2 - 4a_n + 3\) is always positive, confirming \(a_{n+1} < 3\).

2. **Prove that \(a_n > a_{n+1}\)**:
   - Denote \(a_n\) by \(x\). We need to show:
     \[
     x > \frac{3x^2 + 4x - 3}{4x^2}
     \]
     This simplifies to:
     \[
     4x^3 > 3x^2 + 4x - 3
     \]
     \[
     4x^3 - 3x^2 - 4x + 3 > 0
     \]
     Let \(f(x) = 4x^3 - 3x^2 - 4x + 3\). We need to show \(f(x) > 0\) for \(1 < x < 3\).

     - The derivative \(f'(x) = 12x^2 - 6x - 4\):
       \[
       f'(x) = 12x^2 - 6x - 4
       \]
       Solving \(f'(x) = 0\):
       \[
       12x^2 - 6x - 4 = 0
       \]
       \[
       x = \frac{6 \pm \sqrt{36 + 192}}{24} = \frac{6 \pm \sqrt{228}}{24} = \frac{6 \pm 2\sqrt{57}}{24} = \frac{3 \pm \sqrt{57}}{12}
       \]
       Both solutions are less than 1, so \(f(x)\) is increasing for \(x > 1\). Since \(f(1) = 0\) and \(f(x)\) is increasing for \(x > 1\), \(f(x) > 0\) for \(1 < x < 3\).

3. **Conclusion for part (a)**:
   - We have shown \(1 < a_n < 3\) and \(a_n > a_{n+1}\) for all \(n\).

\(\blacksquare\)

Solution for part (b):
1. From part (a), we know \(a_n\) is a decreasing sequence bounded below by 1.
2. By the Monotone Convergence Theorem, a bounded and monotone sequence converges.
3. Let \(\lim_{n \to \infty} a_n = L\). Then:
   \[
   L = \frac{3L^2 + 4L - 3}{4L^2}
   \]
   \[
   4L^3 = 3L^2 + 4L - 3
   \]
   \[
   4L^3 - 3L^2 - 4L + 3 = 0
   \]
   Factoring the polynomial:
   \[
   (L - 1)(4L^2 + L - 3) = 0
   \]
   Solving \(4L^2 + L - 3 = 0\):
   \[
   L = \frac{-1 \pm \sqrt{1 + 48}}{8} = \frac{-1 \pm 7}{8}
   \]
   \[
   L = \frac{6}{8} = \frac{3}{4} \quad \text{or} \quad L = -1
   \]
   Since \(1 < L < 3\), the only valid solution is \(L = 1\).

\(\blacksquare\)

Solution for part (c):
1. We know \(\lim_{n \to \infty} a_n = 1\).
2. Consider the product \(a_1 a_2 a_3 \ldots a_n\).
3. Taking the logarithm:
   \[
   \ln(a_1 a_2 a_3 \ldots a_n) = \ln a_1 + \ln a_2 + \ln a_3 + \ldots + \ln a_n
   \]
4. As \(n \to \infty\), \(\ln a_n \to \ln 1 = 0\).
5. Therefore, the sum \(\ln a_1 + \ln a_2 + \ln a_3 + \ldots + \ln a_n\) converges to 0.
6. Hence, the product \(a_1 a_2 a_3 \ldots a_n \to e^0 = 1\).

\(\blacksquare\)

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