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Date: 24-4-2022
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Date: 26-4-2022
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Date: 13-3-2022
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Robertson's apex graph is the 15-vertex graph illustrated above constructed by Neil Robertson as an example of an apex graph that is not -reducible.
The graph may be constructed by adding an apex vertex which is connected to each degree-3 vertex of the (planar) rhombic dodecahedral graph, or by contracting two opposite vertices of the tesseract graph.
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التوتر والسرطان.. علماء يحذرون من "صلة خطيرة"
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