A research on Thurston's inequality for foliations and contact topology

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As a foliation is an integrable tangent plane field, in the case of 1-dimensional line fields, we treated a completely integrable vector field, which satisfies an extra integrability condition. We consider a placement problem of a closed leaf (i.e., a periodic trajectory) of the 1-dimensional foliation tangent to a completely integrable vector field on an open 3-manifold. Such a foliation is given by the inverse images of a submersion to the plane. We gave a necessary and sufficient condition for the realization for any given link, and in the case of a knot, we described the condition by the words of classical invariants.A 2-dimensional foliation transverse to a completely integrable vector field satisfies Thurston's inequality and it gives a natural class of such foliations. Thus, we can consider such a class of foliations is a natural class on an open 3-manifold.