3 ms·
Your argument only works if the 21x21 grid is known to be 4-colorable. But in fact, the 21x21 grid is known not to be 4-colorable.
by panic 15y ago
Your argument only works if the 21x21 grid is known to be 4-colorable. But in fact, the 21x21 grid is known not to be 4-colorable.
- deleted 15y ago[deleted]