General question about integration

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    General Integration
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SUMMARY

The discussion centers on the use of differential notation in integration, specifically the distinction between using "dx" and "∂x" in integrals involving functions of multiple variables. It is established that while "∂" denotes partial derivatives, "dx" is the appropriate notation for integration, even when the integrand is a function of multiple variables. The conversation highlights that path integrals are utilized when integrating with respect to multiple independent variables, and the use of "∂" in this context is not standard practice.

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iScience
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when we do partial derivatives we use the curly ∂ to represent a partial change in something w/ respect to a partial change in something else. but say we have an integral with the integrand as a function of (x,y). why do we not use the curly ∂ as the differential when we integrate?

example..

why is it proper to write
∫2xydx

as opposed to this?

∫2xy∂x
 
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When integrating with respect to two or more variables which may vary independently, it is common to use a path integral, where each variable in the path is parametrized through a single common integration parameter. I have never seen a case where the notation you have indicated was necessary. However, it was a very interesting question and made me have to think for a while. Bravo!
 
∂ is used sometimes
 

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