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psychoslavetoday at 4:01 AM1 replyview on HN

Are they actual project running some business in the wild? I only played with coq in university, while I saw F# being employed in insurance companies. I only heard about lean through HN posts.


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c0balttoday at 4:16 AM

I don't know about running per se but practical applications (as in done for product/service) exist. A notable practitioner for Isabelle and Lean is AWS[0]. There is also TLA+ for a more practical tool.

The most widely used variant of these proof assistants are probably formally verified compilers, like compcert, which are used in some highly regulated industries like aviation.

[0]: https://isabelle.systems/zulip-archive/stream/247541-Mirror.... and https://lean-lang.org/ (Cedar)