*Forma,* Vol. 32 (No. 1), pp. 7-17, 2017

doi:10.5047/forma.2017.002
*Original Paper*

## Dominant Axis Theorem and the Area Preserving Lozi Map

Yoshihiro Yamaguchi^{1}* and Kiyotaka Tanikawa^{2}

^{1}Teikyo Heisei University, Ichihara, Chiba 290-0193, Japan

^{2}National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan

*E-mail address: chaosfractal@iCloud.com

(Received June 19, 2017; Accepted September 23, 2017)

**Abstract. **
In the family of the area preserving Hénon maps (the Hénon maps), the mapping function is quadratic.
Replacing the quadratic function with a piecewise linear function, we obtain the area preserving Lozi map (the
Lozi map). For the Hénon map, the elliptic periodic orbits appearing through rotation bifurcation of the elliptic
fixed point have one orbital point on the particular axis, i.e., the dominant axis. Thus, the dominant axis theorem
holds for the Hénon map. For the Lozi map, the dominant axis theorem does not hold. We make clear the reasons
from the study of bifurcations. For the Lozi map, a new theorem instead of the dominant axis theorem is obtained.

**Keywords: **
Hénon Map, Lozi Map, Symmetric Periodic Orbit, Symmetry Axis, Dominant Axis Theorem

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