Exercise 1
This is the first exercise. Have also a look at the Theorem 1.1 (Needed for the second exercise), the Exercise 2 (This is the second exercise) and the Exercise 3.
Theorem 1.1: Needed for the second exercise
This is a the first theorem. Look at the exercise.
Exercise 2 (This is the second exercise)
Theorem 2.1: a = b
Theorem 2.2
A last theorem.
Exercise 3
This is the third exercise.
Unnumbered #