Let $A$ be the $n\times n$ matrix whose entry in the $i$-th row and $j$-th column is \[\frac1{\min(i,j)}\] for $1\le i,j\le n.$ Compute $\det(A).$
1. **Matrix Definition and Initial Setup:**
   The given matrix \( A \) is an \( n \times n \) matrix where the entry in the \( i \)-th row and \( j \)-th column is \(\frac{1}{\min(i,j)}\). We need to compute the determinant of \( A \).

2. **Column Operations:**
   We use the property that adding a linear multiple of one column to another column does not change the determinant. Label the columns of the matrix \( C_1, C_2, \ldots, C_n \).

3. **Transformation to Lower Triangular Matrix:**
   Consider a new matrix \( B \) where:
   - The first column of \( B \) is \( C_1 \).
   - For \( k \geq 2 \), the \( k \)-th column of \( B \) is \( -(C_k - C_{k-1}) \).

   This transformation involves subtracting \( C_{k-1} \) from \( C_k \) and then multiplying by \(-1\). Since we are performing \( n-1 \) such operations, the determinant of \( B \) is related to the determinant of \( A \) by:
   \[
   \det(B) = (-1)^{n-1} \det(A)
   \]

4. **Analyzing the Entries of \( B \):**
   For \( j \leq k \), the \( j \)-th entry of \( C_k \) is \(\frac{1}{j}\), and for \( j \geq k \), the \( j \)-th entry of \( C_k \) is \(\frac{1}{k}\). Therefore, the \( j \)-th entry of \( C_{k-1} - C_k \) is:
   - \( 0 \) for \( j < k-1 \)
   - \( \frac{1}{k-1} - \frac{1}{k} \) for \( j = k-1 \)
   - \( 0 \) for \( j > k-1 \)

   This makes \( B \) a lower triangular matrix with the diagonal entries being \( \frac{1}{k-1} - \frac{1}{k} \) for \( k = 2, 3, \ldots, n \).

5. **Determinant of Lower Triangular Matrix:**
   The determinant of a lower triangular matrix is the product of its diagonal entries. Therefore:
   \[
   \det(B) = \prod_{k=2}^{n} \left( \frac{1}{k-1} - \frac{1}{k} \right)
   \]

6. **Simplifying the Product:**
   Each term in the product can be simplified as:
   \[
   \frac{1}{k-1} - \frac{1}{k} = \frac{k - (k-1)}{k(k-1)} = \frac{1}{k(k-1)}
   \]
   Thus:
   \[
   \det(B) = \prod_{k=2}^{n} \frac{1}{k(k-1)} = \frac{1}{2 \cdot 1} \cdot \frac{1}{3 \cdot 2} \cdot \frac{1}{4 \cdot 3} \cdots \frac{1}{n \cdot (n-1)}
   \]

7. **Combining the Factors:**
   The product can be written as:
   \[
   \det(B) = \frac{1}{1 \cdot 2} \cdot \frac{1}{2 \cdot 3} \cdot \frac{1}{3 \cdot 4} \cdots \frac{1}{(n-1) \cdot n}
   \]
   This simplifies to:
   \[
   \det(B) = \frac{1}{(n-1)! \cdot n!}
   \]

8. **Final Determinant Calculation:**
   Using the relation \(\det(B) = (-1)^{n-1} \det(A)\), we get:
   \[
   \det(A) = (-1)^{n-1} \cdot \frac{1}{(n-1)! \cdot n!}
   \]

The final answer is \(\boxed{\frac{(-1)^{n-1}}{(n-1)! \cdot n!}}\)