The cos πλ TheoremMatts R. Essén1. The Hellsten-Kjellberg-Norstad inequality
2. The cos πλ -theorem
3. A generalization of the Ahlfors-Heins theorem
4. The Paley conjecture
5. A cos πλ -problem an da differential inequality
6. A counterexample
7. Proof of theorem 5.2
8. Two consequences of a theorem of A. Baernstein
9. On two theorems of A. Baernstein
10. References
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