$\partial(y^T*A*x)/\partial(x)$ Which one is True?
489
How to take the gradient of the quadratic form?
129394
understanding $\frac{\partial x}{\partial y}\frac{\partial y}{\partial z}\frac{\partial z}{\partial x}=-1$
46567
Derivatives of inverse matrix
85076
Is it true that $d(x,Y)=d(x,y_0)$ for some $y_0 \in Y$ when $Y$ is closed?
62211
Partial Differential Equation $U_t - (U_x)^2 = 0$
91359
Are these mixed partial derivatives equal?
63473
Is the shorthand $ \partial_{\mu} $ strictly a partial derivative in field theory?
49408
Proof of the derivative of ln(x)
89057
How does one properly define the derivative of one operator-valued function?
70438
Generalize Clairaut-Schwarz theorem to arbitrary order of mixed partial derivatives
141286
When is $\mathbf{X}^{T}\mathbf{X}+\lambda\mathbf{I}$ invertible?
93967
Prove partial derivatives exist, but not all directional derivatives exists.
27738
Gradient of $a^T X b$ with respect to $X$
148737
Is $|xy|$ differentiable in $(0,0)$?
46265
Minimal polynomial of the operator $T:V\oplus W\to V\oplus W$
51253
Graphical intuition behind directional derivative interpreted as a(∂f/∂x)+b(∂f/∂y), where  is directional vector of unit length?
56429
Extension of partial derivatives and the definition of $C^k(\overline{\Omega})$