Real/complex analysis, functional analysis

  • Yosida, Kosaku. Operational Calculus: A Theory of Hyperfunctions. Springer Science & Business Media, 2012.
  • Spivak, Michael. Calculus On Manifolds: A Modern Approach To Classical Theorems Of Advanced Calculus. CRC Press, 2018. https://doi.org/10.1201/9780429501906.

Information theory

  • MacKay, David J. C. Information Theory, Inference and Learning Algorithms. Cambridge University Press, 2003.
  • Cover, Thomas M., and Joy A. Thomas. Elements of Information Theory. John Wiley & Sons, 2012.

Algebra

  • Lang, Serge. Algebra. Springer Science & Business Media, 2012.

Asymptotic and perturbative methods

  • Bender, Carl M., and Steven A. Orszag. Advanced Mathematical Methods for Scientists and Engineers I: Asymptotic Methods and Perturbation Theory. Springer Science & Business Media, 2013.