How does second partial derivative test be interpreted?
59809
Why/How does the determinant of the Hessian matrix, combined with the 2nd derivatives, tell us max., min., saddle points? Reasoning behind it?
100007
Express partial derivatives of second order (and the Laplacian) in polar coordinates
116283
How to properly interpret a seemingly contradictory result in Mathematica?
124121
Is this logic behind the derivative of $x^x$ a coincidence?
52701
Manipulating Partial Derivatives of Inverse Function
129394
understanding $\frac{\partial x}{\partial y}\frac{\partial y}{\partial z}\frac{\partial z}{\partial x}=-1$
15170
Legendre symbol, second supplementary law
133424
Why do we make a distinction between derivatives and partial derivatives?
30723
Second derivative "formula derivation"
65659
Partial derivative paradox
15287
Proving that second derivative is perpendicular to curve
63473
Is the shorthand $ \partial_{\mu} $ strictly a partial derivative in field theory?
119380
Clarifying question on meaning of derivative of a linear transformation
27812
Understanding the differential $dx$ when doing $u$-substitution
52110
About the second fundamental form
117338
Counterexample to second derivative test when f''(x) is not continuously differentiable
105293
Proof of the second symmetric derivative