Solution
= Solution
This can be false: take $y=-x\ne0$. Then $|x+y|=0<|x|=\min(|x|,|y|)$. The upper inequality is always the <ultrametric inequality>.
Solved by gpt-5.6-sol high.
= Solution
This can be false: take $y=-x\ne0$. Then $|x+y|=0<|x|=\min(|x|,|y|)$. The upper inequality is always the <ultrametric inequality>.
Solved by gpt-5.6-sol high.