  I outline the history and the original proof of the Arnold conjecture on
fixed points of Hamiltonian maps for the special case of the torus, leading to
a sketch of the proof for general symplectic manifolds and to Floer homology.
This is the written version of my talk at the Geometric Dynamics Days 2017
(February 3-4) at the RUB in Bochum.

Symplectic Geometry;Dynamical Systems;History and Overview