when does a partial differential equation have unique solution?
14656
The differential equation $xu_{x}+yu_{y}=2u$ satisfying the initial condition $y=xg(x),u=f(x)$
66919
When/why does the principle of least action plus boundary conditions not uniquely specify a path?
125999
When does a system of equations have no solution?
133545
$y(x)$ be a continuous solution of the initial value problem $y'+2y=f(x)$ , $y(0)=0$
126235
Why does DSolve return two solutions for my ODE?
46764
What is a general solution to a differential equation?
134122
When is differentiating an equation valid?
16946
How many solutions for an equation with simple restrictions
45682
Show that there exists a unique $v_0 \in H^1(0,1)$ such that $u(0)=\int_0^1(u'v_0'+uv_0), \forall u \in H^1(0,1)$
53640
Equality of mixed partial derivatives
131786
Why are second order linear PDEs classified as either elliptic, hyperbolic or parabolic?
57630
Second order homogeneous differential equations: why do repeated roots modify the solution set?
157624
How to force the function to take positive value when solving PDE by NDSolve
115033
Find the solution of the pde $xu_y-yu_x=u$.
35874
Show that when $BA = I$, the solution of $Ax=b$ is unique
153580
Solutions of autonomous ODEs are monotonic
158444
Is this periodic solution unique? (ODE)