Why do some people place the differential at the beginning of their integral?
31979
Notation: Why write the differential first?
50905
Why rationalize the denominator?
40512
Usage of Assuming for Integration
21522
This integral is defined ? $\displaystyle\int_0^0\frac 1x\:dx$
30030
An integration question to be solved without using differentiation under the integral sign.
65924
Logarithmic variables being used while integrating.
130220
Why should the substitution be injective when integrating by substitution?
24805
Why the first moment is standardized before computing higher moments, but higher moments are not?
95265
Why is it legitimate to solve the differential equation $\frac{dy}{dx}=\frac{y}{x}$ by taking $\int \frac{1}{y}\ dy=\int \frac{1}{x}\ dx$?
133424
Why do we make a distinction between derivatives and partial derivatives?
67224
Why is the area under a curve the integral?
150417
Two apparently different antiderivatives of $\frac{1}{2 x}$
112551
Demystify integration of $\int \frac{1}{x} \mathrm dx$
44066
What is the meaning of the integral of position?
75394
Why is the $dx$ right next to the integral sign in QFT literature?
105767
derivative under integral intuition
71726
When can we not treat differentials as fractions? And when is it perfectly OK?