Care and feeding of Discrete Fourier transforms (DTFT), especially Fast Fourier Transforms, and other operators on discrete time series. Complexity results, timings, algorithms, properties. These are useful in a vast number of applications, such as filter design, time series analysis, various nifty optimisations of other algorithms etc.

## Chirp *z*-transform

Chirplets, one-sided discrete Laplace transform related to damped sinusoid representation. (Bluestein 1970; Rabiner, Schafer, and Rader 1969)

A recent publication (Sukhoy and Stoytchev 2019) shows that these are as tractable as FFTs to invert, which is to say, very. I will read the paper and see if that is as useful to me as it seems like it might be, (The paper has a lot of elementary proofreading errors, which is a bad start.)

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## Chromatic derivatives

(Narasimha, Ignjatovic, and Vaidyanathan 2002; Aleksandar Ignjatovic 2007; A. Ignjatovic 2009; Aleksandar Ignjatovic, Wijenayake, and Keller 2018b, 2019, 2018a)

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