A Map between the Symplectic Manifolds and which is a Diffeomorphism and (where is the Pullback Map induced by , i.e., the derivative of the Diffeomorphism acting on tangent vectors). A symplectic diffeomorphism is also known as a Symplectomorphism or Canonical Transformation.
See also Diffeomorphism, Pullback Map, Symplectic Manifold
References
Guillemin, V. and Sternberg, S. Symplectic Techniques in Physics. New York: Cambridge University Press, p. 34, 1984.