Ehi everyone! Today I finally finished the exams of the semester. I am in a aerospace engineering master's degree but i attended the courses "Advanced Physics (i.e. from Lagrange Formalism to Hamilton Jacobi + Advanced EM + Special relativity)" and "Quantum Mechanics". I am particularly interested in mathematics and its formalism within physical theories. I would like some reccomandation about a subject and a book to start studying on my own, given my background. I am interested in Differential Geometry as I would like to study general relativity someday, or Math Logic just because I find it fun, or topology which I assume it to be the foundation of many physical theories.
Thank you.
EDIT: Thanks to everyone!! I look forward to check some of the book you recommended