 1230 Hassan Najafi Alishah, Rafael de la Llave
 Tracing KAM tori in presymplectic dynamical
systems
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Mar 1, 12

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Abstract. We present a KAM theorem for presymplectic dynamical
systems. The theorem has a a posteriori format. We show that given
a Diophantine frequency ! and a family of presymplectic mappings, if we
find an embedded torus which is approximately invariant with rotation
! such that the torus and the family of mappings satisfy some explicit
nondegeneracy condition, then we can find an embedded torus and a
value of the parameter close to to the original ones so that the torus
is invariant under the map associated to the value of the parameter.
Furthermore, we show that the dimension of the parameter space is
reduced if we assume that the systems are exact.
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