NOTICE

math-showcase - copyright and licensing
Copyright (c) 2026 Chayanon Somatanai (Izolyte)

There are three kinds of material in this repository, licensed differently.

1. Written content: the solutions, proofs, and explanations (the prose in
   problems/*.typ and docs/).
   Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0).
   Full text in ./LICENSE, or https://creativecommons.org/licenses/by/4.0/

2. Code: the Typst templates and environments (src/), the scripts (scripts/),
   the Makefile, and the CI config.
   Licensed under MIT. Full text in ./LICENSE-CODE.

3. Problem statements taken from other sources (textbooks, competitions, Stack
   Exchange, and so on). These belong to their original sources, not to this
   repository, and each problem file cites where it came from in its metadata
   (source, source_url, source_license). Mathematical facts like equations,
   theorems, and definitions aren't copyrightable; CC BY 4.0 covers the way each
   solution is written, not the math itself.

Attribution: when you reuse the written content, credit "Chayanon Somatanai
(Izolyte)", link to the CC BY 4.0 license, and note any changes. For example:

    "<solution title>" by Chayanon Somatanai (Izolyte), licensed under CC BY 4.0.
    Source: https://github.com/Izolyte/math-showcase

If you reuse a problem statement (not just the solution), credit that problem's
original source too, as cited in its file.

Stack Exchange: content there is CC BY-SA 4.0 (share-alike). Where a problem
comes from Stack Exchange its file records source_license: "CC BY-SA 4.0". The
solutions here are written independently and aren't derived from any Stack
Exchange answer text, so they stay under CC BY 4.0.