<Verb>HenonOrbit(v,a,b,N,s,d):: List, Rat, Rat, Int, Int, Int --> PureCubicalComplex</Verb><P/>

<P/> Inputs a vector  <M>v=(x_0,y_0)\in \mathbb R^2</M>, rational numbers <M>a,b</M> and integers 
<M>N,s,d</M>. It returns a <M>2</M>-dimensional
pure cubical complex <M>K</M> that models the strange attractor of the Henon map
<M>f\colon \mathbb R^2\rightarrow \mathbb R^2, (x,y)\mapsto (y+1-ax^2,bx)</M>.
 The first <M>N</M> iterates <M>(x_n,y_n)=f(x_{n-1},y_{n-1})</M> are 
computed to <M>d</M> decimal places. The pure cubical complex covers the strange attractor with squares of side <M>1/s</M>.


