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Erdős problem 508

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This upper bound for the chromatic number of the plane was observed by John R. Isbell. His approach was dividing the plane into hexagons of uniform size and coloring them with a repeating pattern. A proof can probably be found in:

How the state got here

0 of 6 recorded
  1. Prior stateNone retained
  2. WorkNo submitted work retained
  3. VerificationNo check retained
  4. DecisionNo Repository has decided
  5. StandingNothing recorded here
  6. Next gapNot recorded

Result history

Published changes, performers, checks, and later corrections.

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No proposed change is retained for this Problem, so there is nothing to show a decision on.

Correction history

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Technical detailsExact roots, source, and retained record identifiers

Exact provenance

Problem row
sha256:c9c7ad5f977235848ba34e87285c05555de13792fe840a0231f5d6b5855efeda
Metadata
sha256:8ed400d17aa8e9321ca69429aade61a404ff741894fe641466af27bb45c77fa1
Observation
sha256:9c8326e865b6017b103af7611c852a06776d81964979b8ab5a1b800cd550dff6
Content
sha256:295a3ae9659a0eea4dfd92f79241669db5aed6f6b3c02def6efda6fd657e40fa
Repository
sha256:a956b84c437202e5a02cc9e036a621bd14a302b34a75758115730bdbb77c52a4
Projection
sha256:a4a96441668a9f8b33afbcb3f696a2639f5fae145f36ddc063d7f67d5fb87ce8
Source commit
36c6d0fef71a3fec84d9dcd5eeca4e22e378f7cb
Upstream sourceInspect recordsSource JSON