Two decades of open computation

Software

I build systems that make serious mathematical computation open, collaborative, and inspectable. The implementation has changed repeatedly; that purpose has not.

Current / 2026

Rebuilding Sage for agents

Sage.js asks what open mathematical software should look like when computational agents can help implement, test, benchmark, and document it.

The project uses SageMath behavior as an executable specification while building a cleaner TypeScript architecture for Node, native applications, Jupyter, and browsers.

Open Sage.js Research context

Systems

One thread through changing architectures

Each project responds to a different constraint: access, integration, collaboration, or verifiability.

2005SageMathA free, open-source alternative to proprietary mathematical systems, built by integrating the strongest available packages behind a coherent Python interface.Open mathematics 2006-2008The Sage notebookAn early browser-based notebook for interactive mathematical computation, written in the era before modern frontend frameworks and before Jupyter existed.Browser computation 2013-presentCoCalcA collaborative computing environment for notebooks, terminals, LaTeX, courses, and shared projects, operated by SageMath, Inc.Collaboration 2026Sage.jsA from-scratch mathematical system in TypeScript, designed around explicit contracts, independent verification, portable runtimes, and productive agent collaboration.Active research

Engineering principles

Power should remain inspectable

Open source matters most when users can understand, verify, extend, and preserve the systems on which their work depends.

Open foundationsBuild on public source, documented algorithms, and reusable mathematical libraries.Collaboration as infrastructureComputation, writing, and communication belong in the same durable workspace.Claims backed by evidenceCompatibility, correctness, and performance need executable tests and visible scope.The implementation recordCurrent projects and historical experiments remain available in public repositories.