The lecture notes for linear algebra by Gilbert Strang can be downloaded from the MIT OpenCourseWare website. The notes are available in PDF format and can be accessed at:
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Classroom mornings were warmer now. Professor Malik motioned to the projector and the same theorems from the PDF unrolled in chalk on the board. Malik had a habit of telling stories between equations: once, he compared orthogonality to two conversations in different rooms — they don’t interfere. Later, during office hours, he slid Strang’s PDF across the table and said, "Start there. Let it be your map."
