- Linear Algebra: Gilbert Strang's book + MIT OCW video series. Alternatively/additionally Sheldon Axler's Linear Algebra Done Right. Must watch 3blue1brown ser

- Linear Algebra: Gilbert Strang's book + MIT OCW video series. Alternatively/additionally Sheldon Axler's Linear Algebra Done Right. Must watch 3blue1brown series on LinAlg. - Analysis: Spivak's Calculus (yes). Understanding Analysis is also supposed to be good. - Probability: Introduction to Probability by Dimitri Bertsekas and John Tsitsiklis. - Graphs: Plenty nice books. Can also choose GT specific chapters from Discrete Math books. Edit: If you haven't have formal Math training, you need to learn how to write proofs. For Proofs, I wholeheartedly recommend Jay Cummings's book "Proof: A Long Form Text Book".