I am Gabriel Loa Peruvian author - editor - researcher of mathematics books, I have been disseminating them for several years, independently - without equipment, without logistics, only with my dreams of contributing a grain of mathematics - reaching the places furthest from me country, in order to explain the importance of learning this beautiful science, poorly taught and neglected by a large number of students (they don't like it, they only study for exams, ONLY TO PASS, BUT NOT TO LEARN!) by Therefore, there will be no interest or enthusiasm to train engineers, doctors, which is what is lacking in most countries, to develop industries, find the cure for diseases, the issue is, how to convince them, that not everything happens with be psychologists, lawyers, communicators ...).
In this sense, the proposal of my books tries to break with classical mathematics, one that only has to do with the abstract point of view, full of exercises and more exercises (TEACHERS THINK THAT STUDENTS ARE MATHEMATICS, and they are not , THINK IT HAS A BASIS, and they don't), therefore, we are not aligned with global mathematics (hence the international exams, they are disastrous).
It requires a concrete mathematics, that you like, that is friendly, that is not fearful, with applications in various areas, such as engineering, health, business science, etc.
I put at your disposal, dear reader, a series of VECTOR CALCULATION books from scratch. There are 9 books divided each one into PARTS, for their best use. Thanks to AMAZON, I will be able to reach millions of students and teachers.