{ x | x is a state which borders indiana}

Ohio

Michigan
Illinois
Kentucky

To find the states that border Indiana, you can follow these steps:

Step 1: Locate Indiana on a map of the United States.
Step 2: Identify the states that share a border with Indiana.

The states that border Indiana are as follows:

- Illinois: Located to the west of Indiana.
- Kentucky: Located to the south of Indiana.
- Michigan: Located to the north of Indiana.
- Ohio: Located to the east of Indiana.

Therefore, the set of states that border Indiana is {Illinois, Kentucky, Michigan, Ohio}.