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+Before disabling any content in relation to this takedown notice, GitHub
+- contacted the owners of some or all of the affected repositories to give them an opportunity to [make changes](https://docs.github.com/en/github/site-policy/dmca-takedown-policy#a-how-does-this-actually-work).
+- provided information on how to [submit a DMCA Counter Notice](https://docs.github.com/en/articles/guide-to-submitting-a-dmca-counter-notice).
+
+To learn about when and why GitHub may process some notices this way, please visit our [README](https://github.com/github/dmca/blob/master/README.md#anatomy-of-a-takedown-notice).
+
+---
+
+**Are you the copyright holder or authorized to act on the copyright owner's behalf?**
+
+Yes, I am authorized to act on the copyright owner's behalf.
+
+**Are you submitting a revised DMCA notice after GitHub Trust & Safety requested you make changes to your original notice?**
+
+No
+
+**Does your claim involve content on GitHub or npm.js?**
+
+GitHub
+
+**Please describe the nature of your copyright ownership or authorization to act on the owner's behalf.**
+
+Our client pays us a monthly fee to remove copyright infringements on his/her behalf. Proof of this arrangement can be sent on request.
+
+**Please provide a detailed description of the original copyrighted work that has allegedly been infringed. If possible, include a URL to where it is posted online.**
+
+Siam Books is the copyright owner of the publication "Introduction to Linear Algebra".
+
+https://my.siam.org/Store/Product/viewproduct/?ProductId=27788546
+
+Case ID: (([private]))
+
+**What files should be taken down? Please provide URLs for each file, or if the entire repository, the repository’s URL.**
+
+https://github.com/JosephChenHub/books_math/blob/master/Introduction%20to%20Linear%20Algebra%2C%204th%20edition--Gilbert%20Strang%20%E6%B8%85%E6%99%B0%E6%89%AB%E6%8F%8F%E7%89%88.PDF
+
+**Do you claim to have any technological measures in place to control access to your copyrighted content? Please see our <a href="https://docs.github.com/articles/guide-to-submitting-a-dmca-takedown-notice#complaints-about-anti-circumvention-technology">Complaints about Anti-Circumvention Technology</a> if you are unsure.**
+
+No
+
+**<a href="https://docs.github.com/articles/dmca-takedown-policy#b-what-about-forks-or-whats-a-fork">Have you searched for any forks</a> of the allegedly infringing files or repositories? Each fork is a distinct repository and must be identified separately if you believe it is infringing and wish to have it taken down.**
+
+Not applicable at this time.
+
+**Is the work licensed under an open source license?**
+
+No
+
+**What would be the best solution for the alleged infringement?**
+
+Reported content must be removed
+
+**Do you have the alleged infringer’s contact information? If so, please provide it.**
+
+We do not have this information at this time.
+
+**I have a good faith belief that use of the copyrighted materials described above on the infringing web pages is not authorized by the copyright owner, or its agent, or the law.**
+
+**I have taken <a href="https://www.lumendatabase.org/topics/22">fair use</a> into consideration.**
+
+**I swear, under penalty of perjury, that the information in this notification is accurate and that I am the copyright owner, or am authorized to act on behalf of the owner, of an exclusive right that is allegedly infringed.**
+
+**I have read and understand GitHub's <a href="https://docs.github.com/articles/guide-to-submitting-a-dmca-takedown-notice/">Guide to Submitting a DMCA Takedown Notice</a>.**
+
+**So that we can get back to you, please provide either your telephone number or physical address.**
+
+[private]  
+[private]  
+
+**Please type your full legal name below to sign this request.**
+
+[private]