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A note on focus-focus singularities. (English) Zbl 0887.58023
The author gives a topological and geometrical description of focus-focus singularities of integrable Hamiltonian systems. In particular, he explains why the monodromy around these singularities is nontrivial, a result obtained by J. J. Duistermaat and others for some concrete systems.
Reviewer: Y.Kozai (Tokyo)

##### MSC:
 37J35 Completely integrable finite-dimensional Hamiltonian systems, integration methods, integrability tests 37K10 Completely integrable infinite-dimensional Hamiltonian and Lagrangian systems, integration methods, integrability tests, integrable hierarchies (KdV, KP, Toda, etc.) 70H05 Hamilton’s equations 37J99 Dynamical aspects of finite-dimensional Hamiltonian and Lagrangian systems
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