high school: put dx at the end of ∫ f(x) dx to indicate you're integrating over x college: dx just is a multiplicative factor so ∫ dx f(x) is fine grad school: i dO wHaT I wAnTpic.twitter.com/ZFGslT8hpF
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That, except you only use one massive partial derivative sign
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i’m calling the authorities
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Integral (anti derivative) of f(x) = x f(x) ("d"s cancels out ;)
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