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BP1247 No straight path from one side of the panel to the other passes through the grey shape without hitting a black region vs. such a path exists.
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REFERENCE

https://en.wikipedia.org/wiki/Opaque_set

CROSSREFS

Adjacent-numbered pages:
BP1242 BP1243 BP1244 BP1245 BP1246  *  BP1248 BP1249 BP1250 BP1251 BP1252

KEYWORD

precise, allsorted, unwordable, notso

CONCEPT imagined_line_or_curve (info | search)

WORLD

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AUTHOR

Leo Crabbe

    page 1

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