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# calm
> **c**alm **a**bstract **l**ambda **m**achine
- **Strong** reduction (reduction inside abstractions) of
**call-by-need** lambda calculus
- Originally intended as reducer of the
[`bruijn`](https://github.com/marvinborner/bruijn) programming
language
- Useful for proof assistants or as a high-level lambda-term reducer
of functional programming languages
- Based on bleeding-edge research results
- Exponentially big normal forms of the family $e_n=λx.c_nωx$, where
$ω:=λx.xx$ and $c_n$ denotes the $n$-th Church numeral, consume only
a linear in $n$ amount of memory and are computed in linear
time\[0\]
## Libraries
- [CHAMP](https://github.com/ammut/immutable-c-ollections) \[MIT\]:
Underrated efficient hash array mapped trie
- [BDWGC](https://github.com/ivmai/bdwgc) \[MIT\]: Boehm-Demers-Weiser
Garbage Collector
## Research
Interesting/relevant research in no particular order:
0. Biernacka, M., Charatonik, W., & Drab, T. (2022). A simple and
efficient implementation of strong call by need by an abstract
machine. Proceedings of the ACM on Programming Languages, 6(ICFP),
109-136.
1. Accattoli, B., Condoluci, A., & Coen, C. S. (2021, June). Strong
call-by-value is reasonable, implosively. In 2021 36th Annual
ACM/IEEE Symposium on Logic in Computer Science (LICS) (pp. 1-14).
IEEE.
2. Balabonski, T., Lanco, A., & Melquiond, G. (2021). A strong
call-by-need calculus. arXiv preprint arXiv:2111.01485.
3. Accattoli, B., Condoluci, A., Guerrieri, G., & Coen, C. S. (2019,
October). Crumbling abstract machines. In Proceedings of the 21st
International Symposium on Principles and Practice of Declarative
Programming (pp. 1-15).
4. Accattoli, B., & Coen, C. S. (2015, July). On the relative
usefulness of fireballs. In 2015 30th Annual ACM/IEEE Symposium on
Logic in Computer Science (pp. 141-155). IEEE.
5. Condoluci, A., Accattoli, B., & Coen, C. S. (2019, October). Sharing
equality is linear. In Proceedings of the 21st International
Symposium on Principles and Practice of Declarative Programming
(pp. 1-14).
6. Accattoli, B., & Leberle, M. (2021). Useful open call-by-need. arXiv
preprint arXiv:2107.06591.
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