Author Description

This note is a reference book for students who study fundamental mathematics courses in high school and college, or who study pre-requisites for calculus courses. It covers basic algebra, projective geometry, and trigonometry briefly. Different from usual precalculus textbooks, this reference book contains only important mathematical concepts in precalculus, and corresponding examples, exercise problems without applications. In other words, one can understand it as a summary note for precalculus.