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# Forum: Differential Equations

Advanced calculus topics from Diff EQ go here.

1. ### Sticky: Read Before Posting!

• Replies: 0
• Views: 14,598
Ted
10-04-2006, 10:13 PM
1. ### 1st- & 2nd-order differential eqns: ds/dt= u-gt, 60 d^2x/dt^2 + 500dx/dt + 900x = 0

• Replies: 2
• Views: 309
05-21-2018, 12:29 PM
2. ### Find soln of PDE for given boundary conditions: (1/r)*∂/∂r(r*∂Φ/∂r) + ∂^2(Φ)/∂z^2...

• Replies: 1
• Views: 210
05-18-2018, 04:00 PM
3. ### Autonomous ODE, determine initial value given limit[x->infty] y(x) = 15/2

• Replies: 1
• Views: 265
05-10-2018, 04:12 PM
4. ### Nondimensionalising and solving nonhomogeneous heat equation

• Replies: 2
• Views: 194
05-07-2018, 11:02 AM
5. ### Trouble finding particular soln to this diff eqn: y''(x) + (nπa/l)2 y(x) = Asin(x/l)

• Replies: 4
• Views: 572
05-03-2018, 08:49 AM
6. ### Difficulty in solving differentiate eqn: rabbit reproduction versus disease

• Replies: 3
• Views: 296
04-30-2018, 12:03 PM
7. ### What is 1st order homogenous differential equation? (x^2+y^2)dx-2xy dy=0

• Replies: 2
• Views: 286
04-30-2018, 08:22 AM
8. ### Question about a Pertubation Problem: y''+vy^(1/2)+8=x

• Replies: 1
• Views: 230
04-19-2018, 08:40 PM
9. ### Solve the PDE: $u_t + xu_x = -tu, x \in R, t > 0; \: u(x,0) = f(x), x \in R$

• Replies: 0
• Views: 165
04-15-2018, 01:30 AM
10. ### Reduce y'' + y''' Sin(y) = 0 to first order and solve

• Replies: 4
• Views: 1,641
04-13-2018, 09:59 AM
11. ### Laplace transform: steps between f(t)= cos(t-5+5)H(t-5) and f(t)= cos(t-5)cos5 H(t-5)

• Replies: 2
• Views: 215
04-11-2018, 05:31 AM
12. ### Diff-EQ: At time t=0, James was given unknown amount of unknown radioactive substance

• Replies: 2
• Views: 453
04-02-2018, 10:02 AM
13. ### ODE y''+y=4*x*sin x. Guessing particular solution?

• Replies: 5
• Views: 402
03-30-2018, 01:29 PM
14. ### How to solve this linear hom. ODE? (d bar{h})/dt+(K/S_s)a^2 bar{h}=-(K/S_s)aH(h_b)(t)

• Replies: 0
• Views: 593
02-21-2018, 05:29 AM

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