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W2006150446 abstract "For d≥2, Walkup’s class K(d) consists of the d-dimensional simplicial complexes all whose vertex-links are stacked (d−1)-spheres. Kalai showed that for d≥4, all connected members of K(d) are obtained from stacked d-spheres by finitely many elementary handle additions. According to a result of Walkup, the face vector of any triangulated 4-manifold X with Euler characteristic χ satisfies f1≥5f0−152χ, with equality only for X∈K(4). Kühnel observed that this implies f0(f0−11)≥−15χ, with equality only for 2-neighborly members of K(4). Kühnel also asked if there is a triangulated 4-manifold with f0=15, χ=−4 (attaining equality in his lower bound). In this paper, guided by Kalai’s theorem, we show that indeed there is such a triangulation. It triangulates the connected sum of three copies of the twisted sphere product S3S1. Because of Kühnel’s inequality, the given triangulation of this manifold is a vertex-minimal triangulation. By a recent result of Effenberger, the triangulation constructed here is tight. Apart from the neighborly 2-manifolds and the infinite family of (2d+3)-vertex sphere products Sd−1×S1 (twisted for d odd), only fourteen tight triangulated manifolds were known so far. The present construction yields a new member of this sporadic family. We also present a self-contained proof of Kalai’s result." @default.
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W2006150446 date "2011-06-01" @default.
W2006150446 modified "2023-09-24" @default.
W2006150446 title "On Walkup’s class <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si1.gif display=inline overflow=scroll><mml:mi mathvariant=script>K</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mi>d</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> and a minimal triangulation of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si2.gif display=inline overflow=scroll><mml:msup><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:msup><mml:mrow><mml:mi>S</mml:mi></mml:mrow><mml:mrow…" @default.
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W2006150446 doi "https://doi.org/10.1016/j.disc.2011.02.032" @default.
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