Hum... I don't think the integral "operator" applies by multiplication.
You can put the dx at the beginning of the integral, but not before it.
this post was submitted on 14 Jul 2025
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Physicists be like: whitness me
Nobody on your link is treating the integral "operator" as multiplicative.
dx \int f(x) is blatantly different from \int f(x) dx
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(4 replies)
My initial thought was that it's surprising that the engineer is using i whereas the mathematician is using j. But I know some engineers who are hardcore in favour of i. No mathematicians who prefer j though. So if such an engineer were dating a mathematician of all people who used j, I could see that being ♠ .
Physicist behavior
But physicists actually do that? They often write it like this: ∫ dx f(x) or this: ∫∫∫ dxdydz f(x,y,z)