Is it possible to draw this shape without double lines or lifting your pen frame the paper? Or perhaps by only doubling one of the horizontal lines?
The geometric principle you're interrogating is traversability. There are many online articles explaining rigorous proofs of traversable or non-traversable networks.
That gives me a lead, thanks!
@gbj_tester started
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Is it possible to draw this shape without double lines or lifting your pen frame the paper? Or perhaps by only doubling one of the horizontal lines?