# Course Notes

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Portions of these notes are new for the Spring 2021 semester, and they are very much a work in progress, and they'll likely be updated/augmented/refined throughout the semester. If you notice mistakes (big or small), if you have questions, if anything is unclear, if there are things not covered here that you'd like to see covered, or if you have any other suggestions; please get in touch either by posting to the course notes section of the forum, or by email to 6.009-staff@mit.edu.