Terms of use

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Lessons, notes and questions are free for your personal study. You may share links to them.
Please don't re-upload, sell or republish the videos, notes or questions without permission.
Everything is provided "as is" for study only, without any warranty. See the disclaimer.
Sources and third-party works (for example, cited papers) belong to their owners and keep their own licences.

Last updated: November 2026.