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Grassmann formula for certain type of modules. (English) Zbl 0860.13006

Let \(A\) be a commutative local ring whose maximal ideal has finite Loewy length. The author extends to finitely generated free \(A\)-modules several results which are well-known for finite-dimensional vector spaces. For example, linearly independent sets of elements can be extended to bases, submodules are direct summands, hyperplanes are kernels of homomorphisms onto \(A\). The author also proves an analogue of the rank-nullity theorem.
Reviewer: Ph.Schultz (Perth)

MSC:

13C10 Projective and free modules and ideals in commutative rings
13E15 Commutative rings and modules of finite generation or presentation; number of generators
15A03 Vector spaces, linear dependence, rank, lineability

References:

[1] McDonald B. R.: Geometric algebra over local rings. Pure and applied mathematics, New York, 1976. · Zbl 0346.20027
[2] Anderson F. W., Fuller F. K.: Rings and Categories of Modules. Springer Verlag, New York, 1973.
[3] Machala F.: Fundamentalsätze der projektiven Geometrie mit Homomorphismus. Rozpravy ČSAV, řada matem. a přír. věd 90, sešit 5, Academia, Praha, 1980. · Zbl 0457.51003
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