This lot of 6 math books includes textbooks on mathematics, operating systems, and databases. Written in English by various authors, these books cover a range of levels including beginner, intermediate, advanced, proficiency, and technical. Perfect for high school, adult education, and further education, these textbooks provide a comprehensive understanding of operating systems and database principles. Whether you are a beginner or an advanced student, this collection of textbooks offers valuable insights and practical approaches to these essential subjects.