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Figure 3
Two topologically distinct (non-isomorphic) chain graphs: (a) a chain graph of four-membered rings (squares), and (b) a chain graph of six-membered rings (hexagons) in which edges that extend outside the repeat unit in the +c and −c directions are shown with green and red arrows, respectively. (c), (d) The wrapped graphical representations of (a) and (b) are topologically identical (isomorphic) and differentiated by indicating the direction of wrapped (curved) edges with red and green arrows. Straight black arrows in (a) and (b) indicate the infinite extension of chain graphs in the +c and −c directions. Curved black arrows indicate how edges are wrapped in (a) and (b), and curved black lines represent wrapped edges in (c) and (d). Dashed black lines show the repeat units of each chain graph.

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ISSN: 2053-2733
Volume 78| Part 3| May 2022| Pages 212-233
https://doi.org/10.1107/S2053273322001747
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