 # Wang

63

82

## Mathematical precise definition of a PDE being elliptic, parabolic or hyperbolic

Nov 26 '16 at 18:08

23

## PDEs on Manifolds

Aug 23 '12 at 21:22

24

## Why separation of variables works in PDEs?

Nov 21 '13 at 9:08

12

12

## What kinds of PDE can't be solved by separation of variables?

Jun 16 '13 at 18:01

5

May 21 at 19:18

1

Jun 7 at 16:30

2

## Verify the identity: $\tan^{-1} x +\tan^{-1} (1/x) = \pi /2$

Aug 9 '16 at 4:14

2

## Number of zeroes of solution to $y''(x)+e^{x^2}y(x)=0$ in $[0,3π]$

Dec 30 '16 at 6:49

3

4

## What is the 'linearization' of a PDE?

Nov 13 '16 at 23:14

3

2

2

## How to create theorem boxes

Feb 29 '16 at 1:23

7

2

## Prove that $y_1(x)=\sin(x^2)$ can't be a solution for a linear homogeneous second order differential equation.

Nov 30 '15 at 18:57

2

1

3

2

## Bounding solutions of ODE

Oct 22 '17 at 21:22

1

## Solution to second order non constant differential equation without first derivative

Oct 24 '17 at 19:10

2

1

May 15 at 19:21

3

2

2

## $\sin(t)$ solution of $\ddot{x}=-x$

Oct 13 '17 at 21:15

3

## Show that all solutions of $y'= \frac{xy+1}{x^2+1}$ are of the form $y=x+C\sqrt {1+x^2}$ without solving the ODE

Feb 27 '18 at 11:44

1