Abstract
In this paper we give a generalization of M. Essén's lemma which gives a lower and an upper estimate of the solution of a certain initial value problem.
Acknowledgements
I would like to thank Prof. Sten Kaijser for much valuable advice and my wife Inger for supporting me, and suggesting important improvements.
Notes
E-mail: [email protected]
Dedicated to the memory of Matts Essén who introduced me to this area
Dedicated to the memory of Matts Essén who introduced me to this area