By W. Waliszewski
Warsaw 1965 Rozprawy Matematyczne XLV. Sm.4to., 40pp., unique published wraps. Uncut. VG, mild soiling.
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Extra resources for Categories, groupoids, pseudogroups and analytical structures
17) possesses infinitely many T-periodic solutions. Rabinowitz  had previously shown that systems of the type z = /VHz(t, z) possess at least one T-periodic solution if H(t, z) is a T-periodic bounded perturbation of a super quadratic Hamiltonian H(z). Bahri and Berestycki have derived similar results for the inhomogeneous boundary value problem In order to obtain their results, they applied a topological perturbation method developed by Bahri . Consider the perturbed functional on the sphere ||u|| = l (||u|l is the Dirichlet norm of u).
There is a natural group action induced on T'(M) given by
For example, the spherical harmonics Ylm(6,
Categories, groupoids, pseudogroups and analytical structures by W. Waliszewski