### Refine

#### Keywords

- Lavrentiev regularization (1) (remove)

- Toying with Jordan matrices (1996)
- It is shown that an important resolvent estimate is unstable under small perturbations.

- Lavrentiev regularization (1) (remove)

- Toying with Jordan matrices (1996)
- It is shown that an important resolvent estimate is unstable under small perturbations.