Search Results - "Morrison, Ralph"
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Tropical hyperelliptic curves in the plane
Published in Journal of algebraic combinatorics (01-03-2021)“…ly, tropical hyperelliptic curves are metric graphs that admit a two-to-one harmonic morphism to a tree. They also appear as embedded tropical curves in the…”
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The gonality of queen's graphs
Published in Discrete mathematics (01-12-2024)“…In this paper we study queen's graphs, which encode the moves by a queen on an n×m chess board, through the lens of chip-firing games. We prove that their…”
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Graphs of scramble number two
Published in Discrete mathematics (01-10-2023)“…The scramble number of a graph provides a lower bound for gonality and an upper bound for treewidth, making it a graph invariant of interest. In this paper we…”
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On the Gonality of Cartesian Products of Graphs
Published in The Electronic journal of combinatorics (24-12-2020)“…In this paper we provide the first systematic treatment of Cartesian products of graphs and their divisorial gonality, which is a tropical version of the…”
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Convex lattice polygons with all lattice points visible
Published in Discrete mathematics (01-01-2021)“…Two lattice points are visible to one another if there exist no other lattice points on the line segment connecting them. In this paper we study convex lattice…”
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Tropical images of intersection points
Published in Collectanea mathematica (Barcelona) (01-05-2015)“…A key issue in tropical geometry is the lifting of intersection points to a non-Archimedean field. Here, we ask: where can classical intersection points of…”
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On the scramble number of graphs
Published in Discrete Applied Mathematics (31-03-2022)“…The scramble number of a graph is an invariant recently developed to aid in the study of divisorial gonality. In this paper we prove that scramble number is…”
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The tropical commuting variety
Published in Linear algebra and its applications (15-10-2016)“…We study tropical commuting matrices from two viewpoints: linear algebra and algebraic geometry. In classical linear algebra, there exist various criteria to…”
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Multiplicity-free gonality on graphs
Published in Electronic journal of graph theory and applications (01-01-2023)Get full text
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Iterated and mixed discriminants
Published in Journal of combinatorial algebra (01-01-2023)“…Classical work by Salmon and Bromwich classified singular intersections of two quadric surfaces. The basic idea of these results was already pursued by Cayley…”
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Higher-distance commuting varieties
Published in Linear & multilinear algebra (22-11-2022)“…The commuting variety of matrices over a given field is a well-studied object in linear algebra and algebraic geometry. As a set, it consists of all pairs of…”
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Algorithms for Mumford curves
Published in Journal of symbolic computation (01-05-2015)“…Mumford showed that Schottky subgroups of PGL(2,K) give rise to certain curves, now called Mumford curves, over a non-archimedean field K. Such curves are…”
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Bitangents of tropical plane quartic curves
Published in Mathematische Zeitschrift (01-04-2016)“…We study smooth tropical plane quartic curves and show that they satisfy certain properties analogous to (but also different from) smooth plane quartics in…”
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Commuting graphs of $p$-adic matrices
Published 18-07-2024“…We study the commuting graph of $n\times n$ matrices over the field of $p$-adics $\mathbb{Q}_p$, whose vertices are non-scalar $n\times n$ matrices with…”
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Moduli of tropical plane curves
Published in Research in the mathematical sciences (01-12-2015)“…We study the moduli space of metric graphs that arise from tropical plane curves. There are far fewer such graphs than tropicalizations of classical plane…”
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Tropically planar graphs
Published in Collectanea mathematica (Barcelona) (2023)“…We study tropically planar graphs, which are the graphs that appear in smooth tropical plane curves. We develop necessary conditions for graphs to be…”
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Corrigendum to “Graphs of gonality three”
Published in Algebraic combinatorics (2020)Get full text
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Moduli dimensions of lattice polygons
Published in Journal of algebraic combinatorics (01-03-2022)“…Given a lattice polygon P with g interior lattice points, we can associate to P two moduli spaces: the moduli space of algebraic curves that are non-degenerate…”
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The Gonality of Queen's Graphs
Published 07-12-2023“…In this paper we study queen's graphs, which encode the moves by a queen on an $n\times m$ chess board, through the lens of chip-firing games. We prove that…”
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