Sostactic – polynomial inequalities using sums-of-squares in Lean

  • Hacker News

Current support for nonlinear inequalities in Lean is quite limited. This package attempts to solve this. It contains a collection of Lean4 tactics for proving polynomial inequalities via sum-of-squares (SOS) decompositions, powered by a Python backend. You can use it via Pyth...

  • Published: Apr 18, 2026
  • First seen: Apr 19, 2026

AI Summary

Current support for nonlinear inequalities in Lean is quite limited. This package attempts to solve this. It contains a collection of Lean4 tactics for proving polynomial inequalities via sum-of-squares (SOS) decompositions, powered by a Python backend. You can use it via Pyth...

Best for

Teams evaluating AI product workflows / Builders comparing emerging tools / Operators tracking early category shifts

Why it matters

Primary discovery source is Hacker News.

Key Features

  • Primary public product URL is https://github.com/mmaaz-git/sostactic.
  • Description: Current support for nonlinear inequalities in Lean is quite limited. This package attempts to solve this. It contains a collection of Lean4 tactics for proving polynomial inequalities via sum-of-squares (SOS) decompos....
  • GitHub repository is linked as mmaaz-git/sostactic.
  • Listed on Hacker News as "Sostactic – polynomial inequalities using sums-of-squares in Lean".
  • Source description: Current support for nonlinear inequalities in Lean is quite limited. This package attempts to solve this. It contains a collection of Lean4 tactics for proving polynomial inequalities via sum-of-squares (SOS) decompos....

Use Cases

  • Primary discovery source is Hacker News.
  • A public GitHub repo is available for direct technical review.
  • Hacker News mention is recent (2026-04-18).
  • Primary public product URL is https://github.com/mmaaz-git/sostactic.
  • Description: Current support for nonlinear inequalities in Lean is quite limited. This package attempts to solve this. It contains a collection of Lean4 tactics for proving polynomial inequalities via sum-of-squares (SOS) decompos....

Why Now

Sostactic – polynomial inequalities using sums-of-squares in Lean is appearing on fresh discovery surfaces, so it is worth reviewing while momentum is still forming. Confidence is currently medium (49/100), so treat this as an early signal rather than a settled trend.

Community Signals

Trend score

52.4

24h momentum

Rising

Hacker News points

6

Rising

Facts / Signals / Inference / Unknowns

Facts

  • Listed on Hacker News as "Sostactic – polynomial inequalities using sums-of-squares in Lean".
  • Source description: Current support for nonlinear inequalities in Lean is quite limited. This package attempts to solve this. It contains a collection of Lean4 tactics for proving polynomial inequalities via sum-of-squares (SOS) decompos....
  • Source publish date is 2026-04-18.
  • Description: Current support for nonlinear inequalities in Lean is quite limited. This package attempts to solve this. It contains a collection of Lean4 tactics for proving polynomial inequalities via sum-of-squares (SOS) decompos....
  • GitHub repository is linked as mmaaz-git/sostactic.
  • Primary public product URL is https://github.com/mmaaz-git/sostactic.

Signals

  • Hacker News mention is recent (2026-04-18).
  • A public GitHub repo is available for direct technical review.
  • Primary discovery source is Hacker News.

Inference

  • Public code access can lower evaluation friction for developer audiences.

Unknowns

  • Documentation is not explicitly linked in the current allowed evidence set.
  • No tagline is stored on the current product record.
  • Pricing details are not explicitly linked in the current allowed evidence set.
  • Recent changelog or release history is not explicitly linked in the current allowed evidence set.
  • Release cadence cannot be confirmed unless a changelog or release link is explicitly provided.

Evidence Snapshots

Sostactic – polynomial inequalities using sums-of-squares in Lean

Listed on Hacker News as "Sostactic – polynomial inequalities using sums-of-squares in Lean".

Sostactic – polynomial inequalities using sums-of-squares in Lean GitHub repository

GitHub repository is linked as mmaaz-git/sostactic.

Sostactic – polynomial inequalities using sums-of-squares in Lean official profile

Primary public product URL is https://github.com/mmaaz-git/sostactic.

Alternatives / Related

Original Sources