Given are the curve $y=x^2+x-2$ and a curve which is obtained by tranfering the curve symmetric with respect to the point $(p,\ 2p)$. Let $p$ change in such a way that these two curves intersects, find the maximum area of the part bounded by these curves.
[i]1978 Nagasaki University entrance exam/Economics[/i]
1. **Identify the given curves and their transformations:**
   - The original curve is \( y = x^2 + x - 2 \).
   - The transformed curve is obtained by reflecting the original curve with respect to the point \( (p, 2p) \). The transformation involves shifting the curve such that the new curve is symmetric about \( (p, 2p) \).

2. **Find the equation of the transformed curve:**
   - To find the equation of the transformed curve, we use the symmetry about the point \( (p, 2p) \). The transformation can be expressed as:
     \[
     y' = 4p - y \quad \text{and} \quad x' = 2p - x
     \]
   - Substituting \( y = x^2 + x - 2 \) into the transformation equations, we get:
     \[
     y' = 4p - (x^2 + x - 2) = -x^2 - x + 4p + 2
     \]
   - Rewriting in terms of \( x' \):
     \[
     y' = -x'^2 + (4p + 1)x' - 4p^2 + 2p + 2
     \]
   - Therefore, the equation of the transformed curve is:
     \[
     y = -x^2 + (4p + 1)x - 4p^2 + 2p + 2
     \]

3. **Find the intersection points of the two curves:**
   - Set the equations of the two curves equal to each other:
     \[
     x^2 + x - 2 = -x^2 + (4p + 1)x - 4p^2 + 2p + 2
     \]
   - Simplify the equation:
     \[
     2x^2 + (1 - 4p - 1)x + 2 + 4p^2 - 2p - 2 = 0
     \]
     \[
     2x^2 - 4px + 4p^2 - 2p = 0
     \]
     \[
     x^2 - 2px + 2p^2 - p - 2 = 0
     \]
   - Solve for \( x \) using the quadratic formula:
     \[
     x = \frac{2p \pm \sqrt{(2p)^2 - 4(2p^2 - p - 2)}}{2}
     \]
     \[
     x = \frac{2p \pm \sqrt{4p^2 - 8p^2 + 4p + 8}}{2}
     \]
     \[
     x = \frac{2p \pm \sqrt{-4p^2 + 4p + 8}}{2}
     \]
     \[
     x = \frac{2p \pm 2\sqrt{-p^2 + p + 2}}{2}
     \]
     \[
     x = p \pm \sqrt{-p^2 + p + 2}
     \]

4. **Determine the range of \( p \) for which the curves intersect:**
   - The discriminant must be non-negative for real solutions:
     \[
     -p^2 + p + 2 \ge 0
     \]
     \[
     p^2 - p - 2 \le 0
     \]
     \[
     (p - 2)(p + 1) \le 0
     \]
   - Solving the inequality:
     \[
     -1 \le p \le 2
     \]

5. **Calculate the area between the curves:**
   - The area between the curves is given by:
     \[
     A = \int_{x_1}^{x_2} \left| x^2 + x - 2 - \left( -x^2 + (4p + 1)x - 4p^2 + 2p + 2 \right) \right| \, dx
     \]
     \[
     A = \int_{x_1}^{x_2} \left| 2x^2 - (4p + 1)x + 4p^2 - 2p - 4 \right| \, dx
     \]
   - The integral can be evaluated over the interval \([x_1, x_2]\) where \( x_1 = p - \sqrt{-p^2 + p + 2} \) and \( x_2 = p + \sqrt{-p^2 + p + 2} \).

6. **Maximize the area:**
   - To find the maximum area, we need to evaluate the integral for different values of \( p \) within the range \(-1 \le p \le 2\) and find the maximum value.

The final answer is \(\boxed{None}\) (since it is a proof).