Discrete Tomography and plane partitions |
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Authors: | P Dulio C Peri |
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Institution: | 1. Dipartimento di Matematica “F. Brioschi”, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy;2. Università Cattolica S. C., Via Emilia Parmense 84, I-29122 Piacenza, Italy |
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Abstract: | A plane partition is a p×q matrix A=(aij), where 1?i?p and 1?j?q, with non-negative integer entries, and whose rows and columns are weakly decreasing. From a geometric point of view plane partitions are equivalent to pyramids , subsets of the integer lattice Z3 which play an important role in Discrete Tomography. As a consequence, some typical problems concerning the tomography of discrete lattice sets can be rephrased and considered via plane partitions. In this paper we focus on some of them. In particular, we get a necessary and sufficient condition for additivity, a canonical procedure for checking the existence of (weakly) bad configurations, and an algorithm which constructs minimal pyramids (with respect to the number of levels) with assigned projection of a bad configurations. |
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Keywords: | primary 05A17 05D05 secondary 11P81 15A36 |
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