A 432-page version is available for online viewing or download on Scribd .
If you tell me you're studying (e.g., linear algebra, basic equations, or software-based math), I can point you to the exact Vavilov PDF most relevant to your level. Nikolai Vavilov, mathematics and life - Springer Nature
V.V. Vavilov, I.I. Melnikov, S.N. Olekhnik, P.I. Pasichenko.
High school students, university applicants, and teachers. Accessing the PDF
