Untangling trigonal diagrams
Erwan Brugallé, Pierre-Vincent Koseleff, Daniel Pecker
Abstract
Erwan Brugallé, Pierre-Vincent Koseleff, Daniel Pecker
Abstract
Let [Formula: see text] be a link of Conway’s normal form [Formula: see text], [Formula: see text], or [Formula: see text] with [Formula: see text], and let [Formula: see text] be a trigonal diagram of [Formula: see text] We show that it is possible to transform [Formula: see text] into an alternating trigonal diagram, so that all intermediate diagrams remain trigonal, and the number of crossings never increases.
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Let [Formula: see text] be a link of Conway’s normal form [Formula: see text], [Formula: see text], or [Formula: see text] with [Formula: see text], and let [Formula: see text] be a trigonal diagram of [Formula: see text] We show that it is possible to transform [Formula: see text] into an alternating trigonal diagram, so that all intermediate diagrams remain trigonal, and the number of crossings never increases.
Key concepts: Trigonal crystal system, Diagram, Trigonal pyramidal molecular geometry, Crystallography, Link (geometry), Combinatorics, Physics, Chemistry