A necessary condition for four-coloring a planar graph (Q5521315)
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scientific article; zbMATH DE number 3233472
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | A necessary condition for four-coloring a planar graph |
scientific article; zbMATH DE number 3233472 |
Statements
A necessary condition for four-coloring a planar graph (English)
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1966
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topology
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