Is it enough to show that $f$ is increasing or decreasing in any interval $I$ that contains both numbers $a$ and $b$?
2026-03-29 11:08:30.1774782510
In order to show or refute: Given a real function $f$ and $a, b \in R$ then $a\leq b \Rightarrow f(a)\leq f(b)$, what should I regard?
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