1. Introduction 2. Preliminaries 3. Bifurcation from a symmetric fixed point with multipliers $\pm 1$ 4. Conditions on generating functions occur generically 5. Bifurcation from a symmetric fixed point $u_0$ of $\phi _{e_0}$ with multipliers which are $n̂{\textrm {th}}$ prime roots of unity, for $n\geq 3$ 6. Normalisation of a family of involutory area preserving maps 7. Generic bifurcations 8. Families of involutory area preserving maps and symmetric Hamiltonian systems Appendix
Bibliography
Includes bibliographical references (pages 163-165)
