An algebraic approach to finite projective planes

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A finite projective plane, or more generally a finite linear space, has an associated incidence complex that gives rise to two natural algebras: the Stanley–Reisner ring R/IΛ and the inverse system algebra R/IΔ . We give a careful study of both of these algebras. Our main results are a full description of the graded Betti numbers of both algebras in the more general setting of linear spaces (giving the result for the projective planes as a special case), and a classification of the characteristics in which the inverse system algebra associated to a finite projective plane has the weak or strong Lefschetz Property.

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© Springer Science+Business Media New York 2015. Publisher’s version of record: https://dx.doi.org/10.1007/s10801-015-0644-8

Publication Title

Journal of Algebraic Combinatorics