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36 votes
21 answers
6k views

Generalizations of Planar Graphs

This is a follow up to Harrison's question: why planar graphs are so exceptional. I would like to ask about (and collect answers to) various notions, in graph theory and beyond graph theory (topology; ...
0 votes
1 answer
377 views

How to prove that there does not exist any plane isotopy from the logarithmic spiral onto the real line? [closed]

Questions. EDIT: readers please note that while this question arose in research, the OP was so hung-up on a question concerning infinite planar graphs that a strong a-forteriori-reason, kindly ...