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A pretzel graph is a graph with graph genus 3 (West 2000, p. 266). Planar, toroidal graphs, and double-toroidal graphs are therefore not pretzel.
Examples of pretzel graphs include the complete graph and complete bipartite graph .
There are no pretzel graphs on 8 or fewer nodes (E. Weisstein, Dec. 12, 2020).
West, D. B. "Surfaces of Higher Genus." Introduction to Graph Theory, 2nd ed. Englewood Cliffs, NJ: Prentice-Hall, pp. 266-269, 2000.
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دراسة تحدد أفضل 4 وجبات صحية.. وأخطرها
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جامعة الكفيل تحتفي بذكرى ولادة الإمام محمد الجواد (عليه السلام)
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