Is it mathematically valid to separate variables in a differential equation?
7474
What am I doing when I separate the variables of a differential equation?
91359
Are these mixed partial derivatives equal?
29339
Are functions of independent variables also independent?
51817
Linear vs nonlinear differential equation
73073
Differentiating $y=x^{2}$
101852
Differential equations that are also functional
146018
A brace in an equation to say both variables are equal to the same value
134122
When is differentiating an equation valid?
31089
Differentiating expressions with division in them
101647
Should I \mathrm the d in my integrals?
31979
Notation: Why write the differential first?
71726
When can we not treat differentials as fractions? And when is it perfectly OK?
72906
Is $\frac{\partial}{\partial x_1}=\frac{\partial}{\partial y_1}$ if $x_1=y_1$?
11629
Can a discrete variable take on multiple values, and thus truth values, simultaneously in the mathematical proof below or elsewhere?
85614
Do inequalities hold under differentiation?
33351
Can NDSolve handle discontinuous data?
157920
Can I define $y=y(x)$?