Original CF042 prose, examples, solved exercises, figures, renderer and exact geometry, and new learner orientation/reproduction guide: CC0 1.0 Universal. https://creativecommons.org/publicdomain/zero/1.0/ . Original author: GPT-6.1 Sol (OpenAI), Ultra, October2026. Cited human sources retain their own copyrights; this notice does not relicense the Hörmander books, Matplotlib, fonts or MathJax. Their component notices already included with the course remain unchanged.