Also called symplectic map.
It is a bijective $f$ map from a symplectic manifold $(M,\omega)$ to another one $(N,\omega')$ that preserves the symplectic forms, i.e.
$$ f^*(\omega')=\omega. $$For example, if the symplectic manifold is the phase space of a classical mechanical system, then it is called a canonical transformation.
In the context of symplectic geometry, symplectomorphisms from $M$ to itself are the natural idea for a symmetry of a symplectic manifold $(M,\omega)$. They constitute symplectic group actions.
A special case are Hamiltonian symmetrys.
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Author of the notes: Antonio J. Pan-Collantes
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