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Differential Equations Forum

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  1. ExtravagantDreams

    Intro. to Differential Equations

    ... 3 4 5
    Jul 3, 2012
    95
    153,674
    Replies: 95
    5
  1. Hector Triana

    I How to solve an ODE to find its solution

    Dec 15, 2018 at 11:28 PM
    6
    413
    Replies: 6
    2
  2. ohaited

    I How to check chaotic system using Lyapunov

    Dec 15, 2018 at 11:35 AM
    3
    210
    Replies: 3
    2
  3. TachyonLord

    I Where does the exponential function come from in roots?

    Dec 15, 2018 at 8:40 AM
    2
    184
    Replies: 2
    1
  4. osilmag

    I Chaos Theory Constants

    Dec 14, 2018 at 5:21 PM
    10
    1,262
    Replies: 10
    9
  5. Somali_Physicist

    B Fourier transform of a constant

    Dec 13, 2018 at 2:53 AM
    2
    182
    Replies: 2
    1
  6. joshmccraney

    I Sturm-Liouville Eigenfunctions

    Dec 11, 2018 at 2:23 AM
    1
    256
    Replies: 1
    1
  7. thoraxepi

    I Transfer Function relating momentum and force

    Dec 10, 2018 at 7:35 PM
    2
    187
    Replies: 2
    1
  8. ohaited

    I How to get a Chaos Sequence from this Equation?

    Dec 10, 2018 at 3:54 AM
    14
    405
    Replies: 14
    1
  9. ohaited

    I How to simplify this Equation

    Dec 9, 2018
    5
    254
    Replies: 5
    0
  10. Hector Triana

    A Partial Differential Equation Mathematical Modelling

    Dec 8, 2018
    2
    523
    Replies: 2
    2
  11. ebangosh

    A Differential Equation to Difference Equation

    Dec 3, 2018
    3
    685
    Replies: 3
    0
  12. Zheng_

    I How do you know when to partially differentiate?

    Dec 2, 2018
    1
    209
    Replies: 1
    1
  13. Jarfi

    A Can I linearize this equation?

    Nov 26, 2018
    5
    421
    Replies: 5
    0
  14. md nabil

    A Solving the Laplace equation over a trapezoidal domain

    Nov 26, 2018
    2
    211
    Replies: 2
    1
  15. fog37

    I Chain Rule and acceleration as a function of two variables

    Nov 25, 2018
    9
    312
    Replies: 9
    0
  16. Chromatic_Universe

    I Solving a nonlinear first order differential equation

    Nov 20, 2018
    8
    238
    Replies: 8
    1
  17. papanatas

    I Boundary condition 1D beam

    Nov 13, 2018
    1
    275
    Replies: 1
    0
  18. xdrgnh

    A Need help solving Darboux equation

    Nov 12, 2018
    1
    153
    Replies: 1
    0
  19. joshmccraney

    A Numerics: Wronskian and linear independence

    Nov 12, 2018
    1
    342
    Replies: 1
    0
  20. joshmccraney

    A Rayleigh quotient Eigenvalues for a simple ODE

    Nov 11, 2018
    1
    270
    Replies: 1
    2
  21. MathCreature

    I Sketching simple coupled oscillators

    Nov 4, 2018
    3
    575
    Replies: 3
    1
  22. Philip Land

    I Rewriting ODEs

    Oct 25, 2018
    1
    355
    Replies: 1
    0
  23. Josu Aguirrebeitia

    A Solution form for the following differential equation

    Oct 18, 2018
    2
    372
    Replies: 2
    1
  24. Sam D

    I Y'' + y = 0 solution and recursion relation

    Oct 17, 2018
    3
    342
    Replies: 3
    1
  25. joshmccraney

    A Green's functions issue

    Oct 13, 2018
    1
    443
    Replies: 1
    0
  26. kairama15

    A Gravitational Well Position

    Oct 7, 2018
    3
    218
    Replies: 3
    0
  27. joshmccraney

    A Variation of parameters, Green's functions, Wronskian

    Oct 6, 2018
    1
    248
    Replies: 1
    0
  28. sparkie

    I What exactly is linear dependency? 2nd and 3rd Order Diff EQ

    Oct 2, 2018
    1
    314
    Replies: 1
    1
  29. MathCreature

    I Using a bifurcation diagrams and time dependent parameters

    Sep 30, 2018
    2
    273
    Replies: 2
    0
  30. HumanistEngineer

    A Finite Difference Scheme - Plume Entrainment

    Sep 28, 2018
    3
    510
    Replies: 3
    0
  31. binbagsss

    Mathematical Biology- Neumann BCs, Turing Analysis

    Sep 20, 2018
    1
    265
    Replies: 1
    0
  32. bolly

    A Inverted pendulum car - pedulum will not swing

    Sep 15, 2018
    2
    261
    Replies: 2
    1
  33. joshmccraney

    I Metric for knowing when numerical BC is "good"

    ... 2
    Sep 13, 2018
    25
    1,099
    Replies: 25
    1
  34. Ulver48

    A Taylor expansion for a nonlinear system and Picard Iterations

    Sep 11, 2018
    3
    384
    Replies: 3
    1
  35. piggees

    I General solution to a 2nd-order differential equation

    Sep 9, 2018
    7
    464
    Replies: 7
    2
  36. ChanYoung Park

    I Real life application of Euler's method/numerical method

    Sep 7, 2018
    11
    5,084
    Replies: 11
    1
  37. APUGYael

    I Linearity of DE's

    Aug 28, 2018
    8
    230
    Replies: 8
    0
  38. m4r35n357

    I Is this numerical techique for solving ODEs widely known?

    Aug 26, 2018
    3
    589
    Replies: 3
    0
  39. fahraynk

    I Derivation of Lax-Wendroff finite volume scheme

    Aug 20, 2018
    1
    396
    Replies: 1
    0
  40. fahraynk

    I Solving PDE's with chebychev FFT

    Aug 5, 2018
    11
    685
    Replies: 11
    2
  41. HumanistEngineer

    A 1D Convection Diffusion Equation - Inlet Mixing Effect

    Jul 27, 2018
    7
    486
    Replies: 7
    1
  42. nrqed

    A Very simple question about KP hierarchy

    Jul 14, 2018
    1
    625
    Replies: 1
    0
  43. Dimitris Papadim

    I Applications of second order linear non homogenous ordinary differential equations

    Jul 12, 2018
    1
    357
    Replies: 1
    2
  44. K Murty

    I RL circuit with polynomial forcing function solution (units)

    Jul 11, 2018
    6
    333
    Replies: 6
    7
  45. Roboto

    A Runge Kutta - units

    Jul 10, 2018
    16
    831
    Replies: 16
    3
  46. LagrangeEuler

    I Overdamping condition

    Jul 1, 2018
    3
    306
    Replies: 3
    0
  47. cg78ithaca

    A Generalization of hypergeometric type differential equation

    Jun 23, 2018
    2
    620
    Replies: 2
    0
  48. Phylosopher

    I Is the exponential function, the only function where y'=y?

    Jun 23, 2018
    11
    405
    Replies: 11
    9
  49. CE Adamson

    A ODE from Geometry Problem

    Jun 22, 2018
    6
    578
    Replies: 6
    4
  50. Mr Davis 97

    I SHM and the sign of k

    Jun 15, 2018
    2
    378
    Replies: 2
    0
  51. robinegberts

    A Asymptotic solutions to a differential equation

    Jun 13, 2018
    1
    318
    Replies: 1
    1
  52. morenopo2012

    I Heat equation plus a constant

    Jun 13, 2018
    1
    333
    Replies: 1
    0
  53. K Murty

    I Using complex numbers or phasor transform to solve O.D.E's

    Jun 1, 2018
    3
    600
    Replies: 3
    2
  54. mertcan

    A Spectral Theorem to Convert PDE into ODE

    May 30, 2018
    3
    685
    Replies: 3
    0
  55. LSMOG

    I Second order ordinary differential equation to a system of first order

    May 26, 2018
    3
    466
    Replies: 3
    0
  56. Riotto

    I Can all differential equations be turned into algebraic equations via the FT?

    May 25, 2018
    1
    366
    Replies: 1
    0
  57. joshmccraney

    A Inverse ODE, Green's Functions, and series solution

    May 19, 2018
    4
    644
    Replies: 4
    2
  58. Gribouille

    A Vector differential equation

    May 17, 2018
    6
    730
    Replies: 6
    1
  59. arehman1289

    A Stefan Problem

    May 8, 2018
    1
    309
    Replies: 1
    0
  60. joshmccraney

    A RK4 on numerical RHS

    May 2, 2018
    5
    612
    Replies: 5
    1
  61. Voq

    I Linear differential equation

    May 1, 2018
    1
    438
    Replies: 1
    1
  62. swampwiz

    I What is term for DEQ that only has terms of a derivative?

    Apr 30, 2018
    4
    318
    Replies: 4
    0
  63. timetraveller123

    Confusion about series solutions to differential equations

    Apr 30, 2018
    10
    842
    Replies: 10
    5
  64. Karagoz

    B What's the difference between 1000e^0.05t and 1000*1.05^t?

    Apr 22, 2018
    5
    491
    Replies: 5
    0
  65. dRic2

    I What does this line mean?

    Apr 18, 2018
    12
    628
    Replies: 12
    4
  66. synMehdi

    A Pontryagin minimum principle with control constraints

    Apr 5, 2018
    8
    708
    Replies: 8
    2
  67. joshmccraney

    A Green's function not self adjoint for self adjoint ODE

    Apr 3, 2018
    1
    535
    Replies: 1
    0
  68. mertcan

    A Runge Kutta finite difference of differential equations

    Apr 3, 2018
    6
    807
    Replies: 6
    0
  69. Christofer Br

    B How to calculate travel time as a function of distance

    Apr 2, 2018
    6
    450
    Replies: 6
    0
  70. Arman777

    I Cauchy-Euler Diff. Eqn

    Apr 2, 2018
    4
    510
    Replies: 4
    0
  71. hunt_mat

    A Stability for a system of nonlinear ODEs

    Mar 27, 2018
    9
    870
    Replies: 9
    0
  72. wmrunner24

    A Intermediate Axis Theorem - Lyapunov's Indirect Method

    Mar 25, 2018
    1
    539
    Replies: 1
    0
  73. Another

    I Laplace's equation

    Mar 21, 2018
    3
    543
    Replies: 3
    0
  74. joshmccraney

    A Solving an ODE Eigenvalue Problem via the Ritz method

    Mar 15, 2018
    1
    599
    Replies: 1
    0
  75. Dubz

    I Cross product?

    Mar 15, 2018
    2
    437
    Replies: 2
    0
  76. Another

    I Laplace's equation in 3 D

    Mar 14, 2018
    5
    481
    Replies: 5
    0
  77. joshmccraney

    A Legendre's ODE

    Mar 7, 2018
    5
    622
    Replies: 5
    3
  78. learn.steadfast

    I Minimizing a non-linear ODE in f, f_t

    Mar 2, 2018
    5
    581
    Replies: 5
    0
  79. Tunalover

    I A common 2nd order ODE from dynamics but...

    Feb 28, 2018
    8
    566
    Replies: 8
    1
  80. Atr cheema

    A How to simplify the solution of the following linear homogeneous ODE?

    Feb 23, 2018
    1
    724
    Replies: 1
    0
  81. Atr cheema

    I How to find a solution to this linear ODE?

    Feb 22, 2018
    4
    654
    Replies: 4
    0
  82. AAli

    I Trying to obtain a 2nd order ODE

    Feb 21, 2018
    6
    705
    Replies: 6
    1
  83. hunt_mat

    A Applying boundary conditions on an almost spherical body

    Feb 21, 2018
    3
    583
    Replies: 3
    0
  84. SemM

    A Solve a non-linear ODE of third order

    Feb 20, 2018
    5
    583
    Replies: 5
    2
  85. hugo_faurand

    B Calculate the expression of the antiderivative

    Feb 19, 2018
    9
    589
    Replies: 9
    0
  86. joshmccraney

    A Green's Function and Variation of Parameters

    Feb 13, 2018
    1
    574
    Replies: 1
    0
  87. BWV

    I Neural Networks vs Traditional Numerical Methods

    Feb 12, 2018
    2
    553
    Replies: 2
    0
  88. JTC

    A Causality in differential equations

    Feb 10, 2018
    3
    631
    Replies: 3
    1
  89. Hologram0110

    A Numerical solution techniques for 6th order PDE's

    Feb 3, 2018
    1
    501
    Replies: 1
    0
  90. SirVuk

    I What is the propagation speed of a diffusion

    Jan 27, 2018
    4
    931
    Replies: 4
    1
  91. Dor

    A Numerical solution for a two dimensional 3rd order nonlinear diff. eq.

    Jan 22, 2018
    1
    727
    Replies: 1
    0
  92. solanojedi

    A Heat equation on infinite domain

    Jan 20, 2018
    3
    613
    Replies: 3
    0
  93. solanojedi

    A Wave equation in free space

    Jan 18, 2018
    17
    916
    Replies: 17
    0
  94. Mzzed

    I Boundary Conditions for System of PDEs

    Jan 18, 2018
    1
    495
    Replies: 1
    1
  95. joshmccraney

    A Solving linear 2nd order IVP non-constant coefficient

    Jan 14, 2018
    15
    827
    Replies: 15
    3
  96. Ali Baig

    I Complex Fourier Series

    Jan 11, 2018
    2
    607
    Replies: 2
    0
  97. JTC

    A Newmark-Beta vs Predictor Corrector

    Jan 11, 2018
    2
    728
    Replies: 2
    0
  98. Krikri

    A Green's Function ODE BVP

    Jan 9, 2018
    3
    598
    Replies: 3
    0
  99. Ali Baig

    I Classification of First Order Linear Partial Differential Eq

    Jan 5, 2018
    1
    603
    Replies: 1
    1
  100. Mzzed

    I Method for solving gradient of a vector

    Jan 4, 2018
    5
    565
    Replies: 5
    3
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Join in expert discussion on differential equation topics. Differential equations are an equation involving derivatives of a function or functions. Help in solving ODE and PDE problems. Homework help is available.