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Original file (SVG file, nominally 512 × 320 pixels, file size: 27 KB)
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Summary
| Description |
English: Proof without words that a map of US states needs at least 4 colors so that states sharing land borders (disregarding the quadripoint) have different colors by CMG Lee. For example, landlocked Missouri (MO) has 8 neighbors (even). It must be differently colored from all of them, but the neighbors can alternate colors, thus this part of the map needs only 3 colors. However, landlocked Nevada (NV) has 5 neighbors (odd). One of the neighbors must be differently colored from it and all the others, thus 4 colors are needed. The map is from http://commons.wikimedia.org/wiki/File:Blank_US_Map_(states_only).svg . |
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| Author | cmglee, Heitordp |
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Licensing
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- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:46, 15 January 2022 | | 512 × 320 (27 KB) | Cmglee | Uploaded a work by cmglee, Heitordp from {{source thumb|blank_US_Map_(states_only).svg}} with UploadWizard |
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