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Prime filtrations of monomial ideals and polarizations

Research paper by Ali Soleyman Jahan

Indexed on: 04 May '06Published on: 04 May '06Published in: Mathematics - Commutative Algebra



Abstract

We show that all monomial ideals in the polynomial ring in at most 3 variables are pretty clean and that an arbitrary monomial ideal $I$ is pretty clean if and only if its polarization $I^p$ is clean. This yields a new characterization of pretty clean monomial ideals in terms of the arithmetic degree, and it also implies that a multicomplex is shellable if and only the simplicial complex corresponding to its polarization is (non-pure) shellable. We also discuss Stanley decompositions in relation to prime filtrations.