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- W2317242021 abstract "Abstract This paper is concerned with a relation of Darboux in enumerative geometry, which has very useful applications in the study of polynomial vector fields. The original statement of Darboux was not correct. The present paper gives two different elementary proofs of this relation. The first one follows the ideas of Darboux, and uses basic facts about the intersection index of two plane algebraic curves; the second proof is rather more sophisticated, and gives a stronger result, which should also be very useful. The power of the relation of Darboux is then illustrated by the provision of new, simple proofs of two known results. First, it is shown that an irreducible invariant algebraic curve of degree n > 1 without multiple points for a polynomial vector field of degree m satisfies n ≤ m + 1. Second, a proof is given that quadratic polynomial vector fields have no algebraic limit cycles of degree 3." @default.
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- W2317242021 date "2001-01-01" @default.
- W2317242021 modified "2023-09-24" @default.
- W2317242021 title "On a Result of Darboux" @default.
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- W2317242021 doi "https://doi.org/10.1112/s1461157000000863" @default.
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