how to solve $ {\partial u \over \partial t} - k {\partial ^2 u \over \partial x^2} =0$
43294
Solution to 2nd order PDE
59370
Weak solutions to the Neumann's problem (Evans PDE)
8844
Higher-order partial derivatives w.r.t. variable raised to some power
53640
Equality of mixed partial derivatives
54250
To solve the non linear IVP $y'(t)=1-y^2(t)$
100007
Express partial derivatives of second order (and the Laplacian) in polar coordinates
101166
Show that for $\eta > 0$, $\alpha_\eta=-\infty$ and for the Cauchy problem $z'=x-z^2,z(0)=\eta$ the saturated solution is defined up to $+\infty$.
89863
2D Heat equation: inconsistent boundary and initial conditions
146693
To show that differential equation $\lvert{dy\over{dx}}\rvert\,+\mid{y}\mid+1=0 $ has no real solution.
94206
Numerical partial derivative
139419
Problem on the domain of the solution of a differential equation
893
Simple PDE with Neumann BC
117613
Interchange of partial derivative and limit
114505
Initial value problem $t\frac{dx}{dt}=x+\sqrt{t^2+x^2}$
12102
particular solution to $y^{(4)} -2y'' +y = xe^x $ using undetermined coefficients
79822
Problems with partial derivatives.
41666
How to solve a system of PDEs with zip condition?