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doraemonpaul
  • Member for 10 years, 1 month
  • Last seen more than 1 year ago
45 votes

Finding the Derivative of |x| using the Limit Definition

20 votes
Accepted

Particular solution to a Riccati equation $y' = 1 + 2y + xy^2$

13 votes
Accepted

Solving 4th-order PDE

8 votes
Accepted

Stochastic Heat Equation

8 votes

Integral $S_\ell(r) = \int_0^{\pi}\int_{\phi}^{\pi}\frac{(1+ r \cos \psi)^{\ell+1}}{(1+ r \cos \phi)^\ell} \rm d\psi \ \rm d\phi $

7 votes

How to find the general solution of $(1+x^2)y''+2xy'-2y=0$. How to express by means of elementary functions?

7 votes
Accepted

How to solve $y(y'+3)=ax^2+bx+c, \quad a,b,c \in \mathbb{R}$

6 votes
Accepted

Indication on how to solve the heat equations with nonconstant coefficients

6 votes
Accepted

Solve in terms of the Gamma function

6 votes

Given $f(f(x))$ can we find $f(x)$?

6 votes

how to integrate $\int\underbrace{x^{x^{\cdot^{\cdot^x}}}}_ndx$

5 votes

$f(x^2) = xf(x)$ implies that $ f(x) = mx$?

5 votes
Accepted

The tangent half-angle substitution in differential equations

5 votes
Accepted

Finding the general solution of a quasilinear PDE

5 votes
Accepted

how to solve this PDE

5 votes

Use the method of characteristics to solve nonlinear first order pde.

5 votes

Change of variables for heat equation

5 votes
Accepted

Solving $\frac{dx}{dt} = A \frac{ (1-x)}{(t-t^2)} - \frac{(B*x -C*x^2)}{(t-t^2 )*(t-x)}$ (using wolfram/mathematica)

4 votes

Solve :$\frac{dy}{dx}=2\sqrt{y^2+x}$

4 votes

Showing a function satisfies a particular differential equation

4 votes

Solution to 2nd order PDE

4 votes
Accepted

Singular points of ODE

4 votes
Accepted

Transforming Differential Equation to a Kummer's Equation

4 votes

A Differential Equation with Trigonometric Coefficients

4 votes
Accepted

Finding functions $f: \Bbb R_*^+ \to \Bbb R_*^+$ with certain properties

4 votes
Accepted

Differential equation - quick question (first order differential )

4 votes
Accepted

Could someone help solve this PDE?

4 votes
Accepted

When to use Frobenius method

4 votes

Solving an inhomogeneous wave equation

4 votes
Accepted

diffusion equation, inhomogenous boundary conditions (the subtraction method)

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