I'm not getting how to show the first half of the inequality in the yellow highlighted text.
Please help!!
2026-03-31 12:13:38.1774959218
How to show $x_i<x_{i-1}+\delta$?
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It follows from partition norm $\lt \delta$. That means $|x_{i-1} - x_i| \lt \delta$ which implies $x_{i} - x_{i-1} \lt \delta$