Consider an $K \times K$ symmetric positive definite matrix $A$ that has the following properties
- All of its elements are nonnegative and within $0$ and $1$, i.e. $0 < A_{ij} < 1$
- The smallest element of all its diagonal elements is $d$, i.e. $d = \min_{i} A_{ii}$
- The largest element of all its off-diagonal elements is $r$, i.e. $r = max_{i, j} A_{ij}$ for all $i \neq j$
- $d > r$
- Let $\lambda_K$ be the smallest eigenvalue of $A$.
Is there a way to give a lower bound of the minimum eigenvalue of this matrix in terms of $r$ and $d$, like $\lambda_K \ge C\cdot(d - r)$, where $C$ is a constant?
Any help would be appreciated.