Maximum of Seven Colors Needed for Proper Vertex Coloring on Torus/Historical Note
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Historical Note on Maximum of Seven Colors Needed for Proper Vertex Coloring on Torus
This result was known before the Four Color Theorem, its counterpart for planar graphs.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $7$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $7$