?? "picard variety" ... ???? .... ??? "picard stack" .... ???? ..... ?? line bundle over such stack given by "the fiber over point p" .... ???? .... ??? .... ??? .... "duality" .... ??? ....
?? smooth dynamical system with all orbits nice and closed .... ???? renormalized to be all same period ??? .... ??? .... orbit space .... bundle of orietned circels over it .... ??? ....
?? special case where the smooth dynamical system is the "geodesic system" of a riemannian manifold ....
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