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Original file (SVG file, nominally 324 × 324 pixels, file size: 13 KB)
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Summary
| Description |
English: An apex graph, used by Neil Robertson as an example of a graph that is linklessly embeddable but not YΔY-reducible. It can be formed by connecting a new vertex (the apex, shown in red) to each degree-three vertex of a rhombic dodecahedron, or by merging two opposite vertices of a four-dimensional hypercube graph to form a single supervertex. It is triangle-free and has minimum degree four, preventing any YΔY-reduction from applying to it. |
| Date | |
| Source | Own work |
| Author | David Eppstein |
Licensing
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I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:56, 21 November 2014 | | 324 × 324 (13 KB) | Watchduck | gray lines as in File:Apex graph.svg |
| 03:27, 2 August 2010 |  | 324 × 324 (2 KB) | David Eppstein | {{Information |Description={{en|1=An apex graph, used by Neil Robertson as an example of a graph that is linklessly embeddable but not YΔY-reducible. It can be formed by |
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