Notes on Diffy Qs (Lebl)

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This is an online homework companion to Notes on Diffy Qs: Differential Equations for Engineers by Jiri Lebl. It comprises hundreds of algorithmic problems carefully organized into problem sets mapped to textbook sections. Use this course as-is, or customize at any level. You can mix-and-match problems from other catalog courses, add problems from the Edfinity problem repository, or write your own

How to use this course

  1. Homework: Assign high quality problems with hints and personalized feedback to develop problem-solving skills.
  2. Testing: Create summative secure online quizzes and tests in minutes. 
  3. Supplementary resources: Embed videos, class notes, and applets alongside assignments.
  4. Intervention: Use rich analytics to identify and monitor at-risk students for timely intervention.
  5. Analytics: Drill down into student performance and identify problematic or difficult topics.
  6. Flipped classroom: Assign pre-class assignments. Save precious class time for discussions.
  7. Emporium classes: Use Edfinity for individual/group work for large enrollment sections in labs.
Interactive, algorithmic problems
Algebraic, graphing, open response; randomized variants, hints, and tips
Adaptive learning and personalization
Each student receives personalized support
to fill learning gaps.
Corequisite course structures
Use pre-built corequisite content,
or create your own.
LMS integration and accessibility
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Import and author WeBWorK problems.


  1. Edfinity Demo
  2. Sec 0.2: Introduction to differential equations
  3. Sec 0.3: Classification of differential equations
  4. Sec 1.1: Integrals as solutions
  5. Sec 1.2: Slope fields
  6. Sec 1.3: Separable equations
  7. Sec 1.4: Linear equations and the integrating factor
  8. Sec 1.5: Substitution
  9. Sec 1.6: Autonomous equations
  10. Sec 1.7: Numerical methods
  11. Sec 1.8: Exact equations
  12. Sec 1.9: First order linear PDE
  13. Sec 2.1: Second order linear ODEs
  14. Sec 2.2: Constant coefficient second order linear ODEs
  15. Sec 2.3: Higher order linear ODEs
  16. Sec 2.4: Mechanical vibrations
  17. Sec 2.5: Nonhomogeneous equations
  18. Sec 2.6: Forced oscillations and resonance
  19. Sec 3.1: Introduction to systems of ODEs
  20. Sec 3.2: Matrices and linear systems
  21. Sec 3.3: Linear systems of ODEs
  22. Sec 3.4: Eigenvalue method
  23. Sec 3.5: Two dimensional systems and their vector fields
  24. Sec 3.6: Second order systems and applications
  25. Sec 3.7: Multiple eigenvalues
  26. Sec 3.8: Matrix exponentials
  27. Sec 3.9: Nonhomogeneous systems
  28. Sec 4.10: Dirichlet problem in the circle and the Poisson kernel
  29. Sec 4.1: Boundary value problems
  30. Sec 4.2: The trigonometric series
  31. Sec 4.3: More on the Fourier series
  32. Sec 4.4: Sine and cosine series
  33. Sec 4.5: Applications of Fourier series
  34. Sec 4.6: PDEs, separation of variables, and the heat equation
  35. Sec 4.7: One dimensional wave equation
  36. Sec 4.8: D’Alembert solution of the wave equation
  37. Sec 4.9: Steady state temperature and the Laplacian
  38. Sec 5.1: Sturm-Liouville problems
  39. Sec 6.1: The Laplace transform
  40. Sec 6.2: Transforms of derivatives and ODEs
  41. Sec 6.3: Convolution
  42. Sec 6.4: Dirac delta and impulse response
  43. Sec 6.5: Solving PDEs with the Laplace transform
  44. Sec 7.1: Power series
  45. Sec 7.2: Series solutions of linear second order ODEs
  46. Sec 7.3: Singular points and the method of Frobenius
  47. Sec 8.1: Linearization, critical points, and equilibria
  48. Sec 8.2: Stability and classification of isolated critical points
  49. Sec 8.3: Applications of nonlinear systems
  50. Sec 8.4: Limit cycles
  51. Sec A.1: Vectors, mappings, and matrices
  52. Sec A.2: Matrix algebra
  53. Sec A.3: Elimination
  54. Sec A.4: Subspaces, dimension, and the kernel
  55. Sec A.5: Inner product and projections
  56. Sec A.6: Determinant