Princeton Labs

Terms of use

Last updated October 25, 2026

These terms cover Princeton Labs and its course sites: PHY 103 Lab (jiacode2030.github.io/phy103-lab/) Multivariable Calculus Lab (jiacode2030.github.io/multivariable-calculus/) and COS 126 Lab (jiacode2030.github.io/cos126-lab/). By using the sites, you agree to them. If you don't agree, please don't use the sites.

1. What these sites are

Princeton Labs is an independent student project by Jiarui Li. It is not affiliated with, reviewed by, or endorsed by Princeton University, its departments, or any course staff. Princeton and course numbers such as PHY 103, MAT 201 and COS 126 are used only to describe which courses the sites follow. The sites are not official course material.

2. Use it to study, not on graded work

The sites are for learning and practice. Follow Princeton's rules on academic integrity and each course's collaboration policy. Don't use the sites on problem sets, labs, quizzes or exams you submit for a grade unless the course staff allow it.

3. No guarantees

I work to keep the content accurate, but it may contain errors, and a course's order or content can change from one semester to the next. The sites are not a substitute for lectures, the textbook, precepts or office hours.

The sites are provided "as is" and "as available", without warranties of any kind, express or implied. That includes accuracy, fitness for a particular purpose and availability. To the fullest extent the law allows, I'm not liable for any loss or damage from using the sites or relying on their content, including grades. Some places don't allow these limits, so they may not all apply to you.

4. Copyright

© 2026 Jiarui Li. All rights reserved. The text, explanations, simulations, diagrams, practice problems and code on these sites are my original work, unless noted otherwise. They are not copies of course problem sets, exams or lecture notes.

You're welcome to use the sites for your own study and to share links with classmates. You may not copy, republish, sell, or build another site or product from the content without written permission. Short quotes with a link back are fine.

If you believe something here infringes your rights, contact me (see below) and I'll look into it right away.

5. Feedback and reports

Reports are posted publicly on GitHub and are covered by GitHub's terms. If you send a correction or suggestion, you agree that I may use it to improve the sites without owing you anything. I may edit or remove any report.

6. Other websites

The sites link to other websites, such as GitHub. I'm not responsible for their content or practices.

7. Changes

I may change the sites or these terms at any time, or stop offering the sites. If these terms change, I'll update the date above. Continuing to use the sites after that means you accept the new terms.

8. Privacy

See the Privacy policy for how the sites handle data.

9. Contact

Open an issue in the PHY 103 Lab or Multivariable Calculus Lab repository. For COS 126 Lab, use the COS 126 Lab repository.