Copyright and attribution
This site exists to make legally free study material easier to follow. It works only if it stays scrupulous about what it does and does not host.
What we host
No copyrighted books, chapters, or PDFs. Not mirrored, not cached, not proxied, not embedded. This site is a set of ordered links and our own written commentary. If you inspect the repository you will find no book files in it, and none are served from our domain.
What we link to
Every reading link points at the server of the author, the publisher, or the university that chose to publish that material freely, typically math.mit.edu or ocw.mit.edu. Following a link takes you to them, not to a copy of ours. Linking to a publicly published page requires no licence, but we label every link with its source so you always know whose material you are opening.
We link only to material the rights holder published for free access. We do not link to unauthorised copies, file lockers, or shadow libraries, and we will not accept contributions that do.
Book attribution
Linear Algebra and Learning from Data, copyright 2019 Gilbert Strang, Wellesley-Cambridge Press
Official page: math.mit.edu/~gs/learningfromdata/. Lecture and problem links go to MIT 18.065, Matrix Methods in Data Analysis, Signal Processing, and Machine Learning (Spring 2018), used under CC BY-NC-SA 4.0.
Course material from MIT OpenCourseWare is used under its Creative Commons licence, which permits non-commercial reuse with attribution. This site is non-commercial: it carries no advertising, sells nothing, and accepts no payment.
Book cover art
We do not reproduce publishers' cover designs. The covers on this site are plain typographic objects we set ourselves from the book's title and author.
Our own writing
The study guides, section commentary, and roadmap structure are original work written for this site. They are released under CC BY-SA 4.0, so you may reuse them with attribution. They summarise and comment on the books in our own words; they do not reproduce the text of any book.
The site's source code is released under the MIT licence and is available at github.com/Dilrukshan7/book.
Please buy the books
A roadmap through free lecture material is a supplement to a book, not a substitute for one. Where a book is sold, we link to buy it. If a book here is useful to you and you can afford a copy, buying it is what keeps authors writing them.
If you are a rights holder
If you believe anything on this site links to material that should not be publicly available, or you would like a link to your work removed for any reason, email dilrukshanofficial@gmail.com. We will act on it promptly. A good-faith request is enough and we will not ask you to justify it. You can also open an issue on the repository if you prefer a public record.