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Elimination of definite fold II. (arXiv:1709.03804v1 [math.GT])

In this paper, we first give a detailed proof to the elimination theorem of definite folds for smooth maps of manifolds of dimension > 2 into the 2-sphere or into the real projective plane, as the proof given in our previous paper lacked some detailed explanations. We also give a new proof from a different viewpoint and also present various explicit examples. Furthermore, we prove the non-existence of singular Legendre fibrations on 3-manifolds, answering negatively to a question posed in our previous paper.查看全文

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