File:Visual proof USA states map needs 4 colors.svg
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Original file (SVG file, nominally 512 × 320 pixels, file size: 27 KB)
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This is a file from the Wikimedia Commons. The description on its description page there is shown below.
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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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File history
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| Date/Time | Dimensions | User | Comment | |
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| current | 19:46, 14 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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