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lecture 35 notes

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@ -371,3 +371,9 @@ Fourier series vs. DFT: If we view the DFT as a [Riemann sum](https://en.wikiped
**Further reading**: See the DSP links from lecture 32.
## Lecture 35 (May 5)
* IIR filter stability: poles zₚ must lie inside the unit circle |zₚ|
* IIR filter design: non-convex and complicated, lots of algorithms and approximations.
* [Kronecker products A⊗B](https://en.wikipedia.org/wiki/Kronecker_product) and ["vectorization" vec(A)](https://en.wikipedia.org/wiki/Vectorization_(mathematics)): expressing "multidimensional linear operations" ([multilinear algebra](https://en.wikipedia.org/wiki/Multilinear_algebra)) as ordinary matrix–vector products.
* pset 6 solutions: coming soon