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# Forum: Differential Equations

Advanced calculus topics from Diff EQ go here.

1. ### Sticky: Read Before Posting!

• Replies: 0
• Views: 15,867
Ted
10-04-2006, 10:13 PM
1. ### Differential Equation-Review Questions Initial Value Problems

• Replies: 1
• Views: 962
09-21-2016, 07:06 AM
2. ### solve the coupled system using eliminations: dx/dt = 2x + 2y, dy/dt = x + 3y

• Replies: 2
• Views: 1,111
09-17-2016, 05:54 PM
3. ### solve the partially decoupled system; plot corresponding soln trajectory; calc. equil

• Replies: 2
• Views: 714
09-17-2016, 05:53 PM
4. ### convert the second order differential equation x" t + 2x' t - 3x t = x into 1st order

• Replies: 1
• Views: 681
09-17-2016, 05:51 PM
5. ### what is the salt content in tank B at precise moment tank B contains 250 gal of soln?

• Replies: 1
• Views: 927
09-17-2016, 05:50 PM
6. ### determine the differential equation which models this circuit; plot the graph of char

• Replies: 1
• Views: 498
09-17-2016, 05:49 PM
7. ### show that the charge reaches a maximum in aging battery generating 200 e-5t volts

• Replies: 1
• Views: 601
09-17-2016, 05:48 PM
8. ### What is the lag time between max inside, outside temperatures of house?

• Replies: 1
• Views: 636
09-17-2016, 05:48 PM
9. ### lake with volume V=100 km^3 is fed by a river at a rate of r km^3 /yr. In addition...

• Replies: 1
• Views: 737
09-17-2016, 05:46 PM
10. ### first order eqns: u' + 2tu = e^(-t2), u = u(t); cos(x)u' + u = 3, u(x/2) = 1, u = u(x

• Replies: 1
• Views: 445
09-17-2016, 05:46 PM
11. ### Find determinant of matrix of second partials (regularities of product life cycle)

• Replies: 1
• Views: 1,094
08-29-2016, 05:00 PM
12. ### How to approach this diff-EQ? (x^3+ xy^2 + y)dx - xdy = 0

• Replies: 4
• Views: 1,850
08-29-2016, 04:53 PM
13. ### Eliminate A and B to obtain the differential equation: y=Asin2x+Bcos3x

• Replies: 1
• Views: 2,070
08-22-2016, 07:07 AM
14. ### few numerical methods question ... ?

• Replies: 5
• Views: 2,303
08-11-2016, 12:23 PM
15. ### Given y'' = y^2, where y'' = (d^2y / dx^2) then, integrate once, get y' = y^3 / 3 ...

• Replies: 2
• Views: 1,060
08-08-2016, 03:53 PM
16. ### Factoring y'''' + 0.45 y''' -0.165y"+ 0.0045y' -0.00175y =0

• Replies: 1
• Views: 1,993
07-23-2016, 08:03 AM
17. ### need help if this equation follows math rules: XA・dμA+XB・dμB=0

• Replies: 3
• Views: 1,508
07-20-2016, 02:13 PM

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