This is from the book introduction to mechanics by Kleppner D. Is it some typo, or something i don’t understand? Does F dt comes down in front of integration?

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    $\begingroup$ Definitely a "bug" in the book typesetting. $\endgroup$ – John Alexiou Jul 31 at 12:06

To me, this looks like a typo which should read something like

$$\underbrace{\int F dt}_{1\text{ collision}}$$

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    $\begingroup$ the "1 collision" just looks like description of integral bounds, so I think it should be $\int_\text{1 collision} F dt$. $\endgroup$ – Umaxo Jul 31 at 5:42

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