Chaotic dynamics can be effectively studied by continuation from an
anti-integrable limit. Using the Henon map as an example, we obtain a simple
analytical bound on the domain of existence of the horseshoe that is equivalent
to the well-known bound of Devaney and Nitecki. We also reformulate the popular
method for finding periodic orbits introduced by Biham and Wenzel. Near an
anti-integrable limit, we show that this method is guaranteed to converge. This
formulation puts the choice of symbolic dynamics, required for the algorithm,
on a firm foundation.Comment: 11 Pages Latex2e + 1 Figure (eps). Accepted for publication in
Physics Lettes