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This set of notes on Lie groups is an update of my "Lectures on Lie Groups." The current version is now organized into chapters, the first 7 of which cover the original material, from a first look at Lie groups through basic material on representations of compact groups, with emphasis on the unitary, orthogonal and spin groups. New chapters make contact with harmonic analysis. The final chapter introduces G2. Appendices provide background and complementary results.