Why the method of separation of variables works?
119763
Why separation of variables works in PDEs?
7474
What am I doing when I separate the variables of a differential equation?
48879
Why do mathematicians use single-letter variables?
29339
Are functions of independent variables also independent?
122957
Intuitive proof of multivariable changing of variables formula (jacobian) without using mapping and/or measure theory?
55890
Why do we use cross products in physics?
47432
Change of Variables in Limits (Part 1)
12010
Integration by partial fractions; how and why does it work?
16644
Why does cancellation of dots $\frac{\partial \dot{\mathbf{r}}_i}{\partial \dot{q}_j} = \frac{\partial \mathbf{r}_i}{\partial q_j}$ work?
27782
Why does this proof of the chain rule not work?
71410
How can I separate a separable function
115963
Need help understanding separable polynomials
90780
Why does implicit differentiation work on non-functions?
35794
Why does synthetic division work?
132239
Why is the solution single-valued?
102203
Elegant manipulation of the variables list
62549
Chain Rule Intuition