FLAT unit-1 Notes on August 18, 2025 https://drive.google.com/file/d/1qPBdLae9t8IKz7UJr-7UxErrmw6qcn78/view?usp=sharing https://docs.google.com/document/d/1Aranq0z2x8mehb00qfc5NsFokEdM3EZV/edit?usp=sharing&ouid=112711162618141236570&rtpof=true&sd=true