My library

 List with helpful resources:

• Textbooks
• Mathematics 
• OpenStax - open source textbooks - online access, PDF download, OpenStax is a non-profit part of Rice University.
• LibreTexts Physics - LibreTexts libraries are supported by the Department of Education Open Textbook Pilot Project; UC Davis
• Classical Mechanics (Dourmashkin)  Chapter 3: Vectors  (LibreTexts textbook)
• Programming
• The C programming Language, by Brian W.Kernighan, Dennis M. Ritchie
• На български език
• Диференциално смятане, Тагамлицки
• Additional information
• CERN documents repo :  Fundamentals of Vector Analysis ( PDF)