leanprover-community/batteries

Verify Binary Heap

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#1,442 opened on Oct 2, 2025

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enhancementhelp wanted

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Description

This is a standard textbook algorithm. It is well implemented in Batteries.Data.BinaryHeap but not verified.

If you're looking to get started with formal verification project in Lean, this should be an interesting one to try!

Contributor guide

Research direction
Study the existing BinaryHeap implementation in Batteries/Data/BinaryHeap.lean and understand the Lean theorem prover basics. Then develop a formal verification proof for the heap properties.
Tech stack
None
Domain
data
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Git
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60