# American Institute of Mathematical Sciences

September  2018, 17(5): 2135-2137. doi: 10.3934/cpaa.2018101

## A note concerning a property of symplectic matrices

 Mathematisches Institut, Justus-Liebig-Universität Gießen, Arndstr. 2, 35392 Gießen, Germany

Received  November 2017 Revised  December 2017 Published  April 2018

Fund Project: The author is supported by DAAD grant 57314604.

This note provides a counterexample to a proposition stated in [1] regarding the neighborhood of certain $4× 4$ symplectic matrices.

Citation: Björn Gebhard. A note concerning a property of symplectic matrices. Communications on Pure & Applied Analysis, 2018, 17 (5) : 2135-2137. doi: 10.3934/cpaa.2018101
##### References:
 [1] A. Boscaggin and R. Ortega, Periodic solutions of a perturbed Kepler problem in the plane: From existence to stability, J. Differ. Equ., 261.4 (2016), 2528-2551.   Google Scholar

show all references

##### References:
 [1] A. Boscaggin and R. Ortega, Periodic solutions of a perturbed Kepler problem in the plane: From existence to stability, J. Differ. Equ., 261.4 (2016), 2528-2551.   Google Scholar
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