## Declarative pearl: deriving monadic quicksort

Shin-Cheng Mu and Tsung-Ju Chiang. In *Functional and Logic Programming (FLOPS)*, Keisuke Nakano and Konstantinos Sagonas, editors, pp. 124-138. April 2020.

[PDF |Agda Proofs]

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# Monad

## Declarative pearl: deriving monadic quicksort

## Adjoint Functors Induce Monads and Comonads

## Deriving Monadic Programs

## Handling local state with global state

## Calculating a backtracking algorithm: an exercise in monadic program derivation

## Equational reasoning for non-determinism monad: the case of Spark aggregation

## An executable sequential specification for Spark aggregation

Shin-Cheng Mu and Tsung-Ju Chiang. In *Functional and Logic Programming (FLOPS)*, Keisuke Nakano and Konstantinos Sagonas, editors, pp. 124-138. April 2020.

[PDF |Agda Proofs]

It is folklore knowledge that a pair of adjoint functors induces a monad and a comonad. Due to my recent work, I had to load relevant information into my brain cache. However, it turned out to be hard for me to find all the pieces of information I need in one place. Therefore, I am going to summarise here what I know and need, hoping it will be helpful for someone like me.

I started to take an interest in reasoning and derivation of monadic programs around 2016-17. Several years having passed, I collaborated with many nice people, managed to get some results published, failed to publish some stuffs I personally like, and am still working on some interesting tiny problems. This post summaries what was done, and what remains to be done.

Koen Pauwels, Tom Schrijvers and Shin-Cheng Mu. In *Mathematics of Program Construction (MPC)*, Graham Hutton, editor, pp. 18-44. Springer, October 2019.

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Shin-Cheng Mu. Tech. Report TR-IIS-19-003, Institute of Information Science, Academia Sinica, June 2019.

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Shin-Cheng Mu. Tech. Report TR-IIS-19-002, Institute of Information Science, Academia Sinica, June 2019.

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Yu-Fang Chen, Chih-Duo Hong, Ondřej Lengál, Shin-Cheng Mu, Nishant Sinha, and Bow-Yaw Wang. *Networked Systems (NETYS)*, pp. 421-438. 2017.

[PDF|Code|Supplementary Proofs]