>>143238831. Discrete mathematics by Chartrand or by Epp
2. Applied probability and statistics by Lefebvre
3. Mathematics for physicists by Altland
4. Mathematical modeling by Meerschaert
5. Partial differential equations by Hillen
6. Applied partial differential equations by Ockendon
7. Book of proof by Hammack
8. Linear algebra done right by Axler
9. Abstract algebra by Lawrence
10. Real analysis by Bartle
11.Complex analysis by Taylor
12. Fourier analysis by Stein
13. Introduction to real analysis by Heil
14. Complex made simple by Ullrich
15. Manifolds and differential geometry by Lee
16. Differential equations by Viana
17. Functional analysis by Buhler
Prerequisites are [5], [10].
18. Partial differential equations by Vasy
19. A course on partial differential equations by Craig
20. Partial differential equations by Shubin
Start separately but at the same time texts 1, 3, 7. You can replace text 11 with text 14 if you want.