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Quotient algebras of Stanley-Reisner rings and local cohomology. (English) Zbl 0761.55015
If a finite simplicial complex \(\Delta\) and a field \(k\) are given then construct the \(k\)-algebra \(k[\Delta]\) generated by the vertices of \(\Delta\) and subject to the relations determined by the requirement that a monomial should be zero if the set of generators appearing in it does not form a simplex of \(\Delta\); this ring \(k[\Delta]\) is called the “Stanley-Reiser ring of \(\Delta\) over \(k\)” and it can be considered as a module over the corresponding polynomial ring. The simplicial complex \(\Delta\) is called “Cohen-Macaulay” (resp. “Buchsbaum”) if the module \(k[\Delta]\) is Cohen-Macaulay (resp. Buchsbaum) (see the author [Nagoya Math. J. 107, 91-113 (1987; Zbl 0601.13011)] and R. Stanley [Combinatorics and commutative algebra (1983; Zbl 0537.13009)]. The author’s main result – his “foggy rank selection theorem” – says that these properties are preserved by the transition to so-called quasi- hereditary subcomplexes. It is applied to obtain general versions of the rank selection theorems of J. Munkres [Mich. Math. J. 31, 113-128 (1984; Zbl 0585.57014)] and R. Stanley [Trans. Am. Math. Soc. 249, 139-157 (1979; Zbl 0411.05012)].

MSC:
55U05 Abstract complexes in algebraic topology
13H10 Special types (Cohen-Macaulay, Gorenstein, Buchsbaum, etc.)
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[1] Hibi, T., Union and glueing of a family of Cohen-Macaulay partially ordered sets, Nagoya math. J., 107, 91-119, (1987) · Zbl 0601.13011
[2] Munkres, J., Topological results in combinatorics, Michigan math. J., 31, 113-128, (1984) · Zbl 0585.57014
[3] Reisner, G., Cohen-Macaulay quotients of polynomial rings, Adv. in math., 21, 30-49, (1976) · Zbl 0345.13017
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[6] Stanley, R., Balanced Cohen-Macaulay complexes, Trans. amer. math. soc., 249, 139-157, (1979) · Zbl 0411.05012
[7] Stanley, R., Combinatorics and commutative algebra, (1983), Birkhäuser Boston/Basel/Stuttgart · Zbl 0537.13009
[8] Stückrad, J.; Vogel, W., Buchsbaum rings and applications, (1986), Springer-Verlag Berlin/Heidelberg/New York · Zbl 0606.13018
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