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README.md
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@ -7,6 +7,8 @@ A Machine-to-Machine interaction system for Lean 4.
Pantograph provides interfaces to execute proofs, construct expressions, and
examine the symbol list of a Lean project for machine learning.
See [documentations](doc/) for design rationale and references.
## Installation
For Nix users, run
@ -15,7 +17,9 @@ nix build .#{sharedLib,executable}
```
to build either the shared library or executable.
Install `elan` and `lake`, and run
Install `lake` and `lean` fixed to the version of the `lean-toolchain` file, and
run
``` sh
lake build
```
@ -24,9 +28,12 @@ This builds the executable in `.lake/build/bin/pantograph-repl`.
## Executable Usage
``` sh
pantograph MODULES|LEAN_OPTIONS
pantograph-repl MODULES|LEAN_OPTIONS
```
The `pantograph-repl` executable must be run with a list of modules to import.
It can also accept lean options of the form `--key=value` e.g. `--pp.raw=true`.
The REPL loop accepts commands as single-line JSON inputs and outputs either an
`Error:` (indicating malformed command) or a JSON return value indicating the
result of a command execution. The command can be passed in one of two formats
@ -37,8 +44,6 @@ command { ... }
The list of available commands can be found in `Pantograph/Protocol.lean` and below. An
empty command aborts the REPL.
The `pantograph` executable must be run with a list of modules to import. It can
also accept lean options of the form `--key=value` e.g. `--pp.raw=true`.
Example: (~5k symbols)
```

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doc/icon.svg
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doc/rationale.md Normal file
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@ -0,0 +1,30 @@
# Design Rationale
A great problem in machine learning is to use ML agents to automatically prove
mathematical theorems. This sort of proof necessarily involves *search*.
Compatibility for search is the main reason for creating Pantograph. The Lean 4
LSP interface is not conducive to search. Pantograph is designed with this in
mind. It emphasizes the difference between 3 views of a proof:
- **Presentation View**: The view of a written, polished proof. e.g. Mathlib and
math papers are almost always written in this form.
- **Search View**: The view of a proof exploration trajectory. This is not
explicitly supported by Lean LSP.
- **Kernel View**: The proof viewed as a set of metavariables.
Pantograph enables proof agents to operate on the search view.
## Name
The name Pantograph is a pun. It means two things
- A pantograph is an instrument for copying down writing. As an agent explores
the vast proof search space, Pantograph records the current state to ensure
the proof is sound.
- A pantograph is also an equipment for an electric train. It supplies power to
a locomotive. In comparison the (relatively) simple Pantograph software powers
theorem proving projects.
## References
* [Pantograph Paper](https://arxiv.org/abs/2410.16429)