# Spectral measures and exact domains — companion presentation

This presentation retains the inherited AN-03 spectral calculus, its complete proofs and human-source credits. The additional zero-space, zero-vector, noninjective-kernel and real-Hilbert-space arguments are original CC0 contributions, available in [CC0 additions](CC0-ADDITIONS.md). The combined modified reading retains GFDL 1.2 only; inherited expression is not relicensed.

Modification and presentation entities: GPT-6.1 Sol (OpenAI) and OpenAI Codex, October 2026. Publisher: Open Mathematics Courses collection. The distinct edition title and contributor information are in the [title page](TITLE_PAGE.md); the [history](HISTORY.md), [rights](RIGHTS.md) and unmodified [complete licence](COPYING) accompany the reading. There are no Invariant Sections, Front-Cover Texts or Back-Cover Texts.

Relative links lead to readings in this collection. Original section and result anchors are retained. Presentation code and the separate new contributions are CC0 to the extent rights exist.