Geodesic
Ideals with Trivial Conormal Bundle
Canadian journal of mathematics, Tome 32 (1980) no. 1, pp. 210-218

Voir la notice de l'article provenant de la source Cambridge University Press

Throughout this paper all rings considered will be commutative, noetherian with identity. If R is such a ring and M is a finitely generated R-module, we shall use v(M) to denote that non-negative integer with the property that M can be generated by v(M) elements but not by fewer.Since every ideal in a noetherian ring is finitely generated, it is a natural question to ask what v(I) is for a given ideal I. Hilbert's Nullstellensatz may be viewed as the first general theorem dealing with this question, answering it when I is a maximal ideal in a polynomial ring over an algebraically closed field.More recently, it has been noticed that the properties of an R-ideal I are intertwined with those of the R-module I/I2. 
Geramita, A. V.; Weibel, C. A. Ideals with Trivial Conormal Bundle. Canadian journal of mathematics, Tome 32 (1980) no. 1, pp. 210-218. doi: 10.4153/CJM-1980-016-4
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