Merge branch 'dev' into doc/rationale

README.md

@@ -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/rationale.md

@@ -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)
+