Differential Equations › Section D · Laplace transforms › Topic D.9

Convolution integrals

The transform of a product is not the product of the transforms. But there is an operation in t whose transform is a product: convolution. It inverts awkward transforms, and it solves equations whose forcing is not even known yet.

In this topic

  • Products of transforms
  • The convolution integral
  • Properties of convolution
  • The convolution theorem
  • Worked example: two routes to one answer
  • Dividing by s means integrating
  • Worked example: an unknown input
  • Response as weighted memory
  • Integral equations
  • Common mistakes to avoid
  • Key takeaways

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