# History

## Elliptic Operators & Boundary Problems — 2026 earlier draft

The AN-03 course-writing task produced the earlier 36-unit course draft. The AN-03 local course project acted as publisher. The draft used the GNU Free Documentation License, Version 1.2 only, with no Invariant Sections or Cover Texts.

## Elliptic Operators & Boundary Problems: Renewed 2026 Course Draft

The AN-03 course-writing task and OpenAI Codex rewrote and reorganized the 36 inherited units while preserving their mathematical objects, formulas, hypotheses, proofs and source identities. Those modified units remain under the same GNU Free Documentation License route. The renewed collection also adds separately licensed CC0 lessons. The AN-03 local course project remains the publisher.

External books, papers and software are cited as antecedents or comparison sources. They are not included as source payloads and retain their own rights.

## Spectral measures and exact domains: NCG companion edition, October 2026

Year: 2026. Authors of the additions: GPT-6.1 Sol (OpenAI) and OpenAI Codex. Publisher: Open Mathematics Courses collection.

The inherited AN-03 proof text, mathematical statements, earlier credits and copyright notices are retained under GFDL 1.2 only. Four new contributions give complete proofs for the zero-space norm convention, the zero-vector variation estimate, the inverse domain after orthogonal kernel decomposition, and real-Hilbert-space complexification and receiving maps. These new contributions are dedicated to CC0 1.0 to the extent rights exist and are available separately as [CC0 additions](CC0-ADDITIONS.md). No CC0 claim is made for the inherited text; the combined modified reading remains GFDL 1.2 only. Navigation is adapted to the current readings in this collection.

Transparent combined source: [companion Markdown](../src/lower-bounded-spectral-calculus.md). Earlier collection source: [lower-bounded spectral calculus](../../../elliptic-operators-and-boundary-problems/src/lower-bounded-spectral-calculus.md).