Differential Equations

Advanced calculus topics from Diff EQ go here.
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Ted
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Help with matrix differential equation: repeated eigenvalues!
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HallsofIvy
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Querie on sketching direction field.
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MarkFL
MarkFL
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Mathematical models and numerical methods: "A motorboat starts from rest..."
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ken_165
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Maxwell Equations
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topsquark
topsquark
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Calculating using dv/dt = dh/dt * dv/dh to find dv/dh and then integrating the answer to get a line
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167
HallsofIvy
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a help for the equation
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MarkFL
MarkFL
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Power series solution help
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promitheus
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Remove function from differential system d^2x/dt^2 + a*dx/dt = j, dj/dt = -b*j - dx/dt + u(t)
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HallsofIvy
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Is there an analytical solution to dCs/dt = gCs(1-Cs/Csmax) - K*(X/Y + c/exp(Yt))? (nonlinear, nonexact)
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amcqueen101
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Prove y' = |y| , y(0)=0 has unique solution, though states of thm's of existence, uniqueness not true
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Dr.Peterson
Dr.Peterson
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Solve y'' - y' = t - e^{-t} using variation of parameters
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54
Eigendorf
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Falling: If resultant force downwards follows the equation F = mg - kv^2, acceleration is a = g - (k/m)v^2
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UKEng20
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Solve differential equation explicitly: dP/dt = 0.2P (1 - P/1000) - 48, using P_0 = 350
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66
Dr.Peterson
Dr.Peterson
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Tricky Riccati DE w/ exponential terms: dE/dt = cB_t + bE_t + a(E_t)^2, s.t. B_t = g(1-e^{ht})/(1-ke^{ht})
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50
pmms12585
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What type of differential equation
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Subhotosh Khan
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Solve 2 second order linear ODEs d^2y/dx^2 + 16(dy/dx) + 55y = 0, d^2y/dx^2 + 22(dy/dx) + 85y = 0, s.t. y(0) = 14
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MarkFL
MarkFL
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Torricelli's Law Problem: ellipsoid (x/5)^2 + (y/4)^2 + (z/3)^2 = 1
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Tom999
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stuck in basic math of general method for differential equations
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sabishaw
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graphing 3D question: z = x - y is a sloped plane. Then is 2 = x - y a line on that plane?
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246
Dr.Peterson
Dr.Peterson
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General Integrating Factor
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Metronome
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