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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.