Proofinity

Proved, not just plausible. We build tools on formal methods: give something an exact meaning in Lean, and let a proof checker say what holds.

declbuild — mathematics without a center. It builds and checks Lean one declaration at a time and gives each one an address computed from its content. Coming soon. proofinity.it/mathematics
polis — formal verification for COBOL. It reads a COBOL estate into a formal model in Lean, then explains it, assesses it and transforms it with changes proven to preserve behaviour. It runs on your own machines. proofinity.it/polis

Open source

The pieces underneath are public, under Apache-2.0:

CA — content-addressed identity for Lean 4 declarations: a SHA-256 address derived from what a declaration says, not from its name, file or project.
Lean bindings to C libraries: redis-lean · arrow-lean (Arrow and Parquet) · kafka-lean · curl-lean · libsodium-lean · zlog-lean

Issues and pull requests are welcome.

Proofinity s.r.l. — Milan, Rome (Italy)