In some places in physics like proving the wave equation,we see that the physicist divides the equation by [itex] dx [/itex] or [itex] \partial x [/itex] or maybe cancels some of them and then says with a smile:You shouldn't tell a mathematician!(adsbygoogle = window.adsbygoogle || []).push({});

I wanna know the ideas of mathematicians about that and wanna know why its wrong?

thanks

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# Treating d

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