Preface

The system of links refers to proofs, explanations, graphic illustrations, examples or some additional information.
The glossary allows to get the access to terms and definitions desired just at that moment as it is necessary, and so you have no to commit to memory all definitions and rules without distinction, retaining them just in case.

Each section of the course has been designed to provide an environment in which you can study mathematical concepts with minimal direction. Opening pages of sections results in a split screen. The matter of a topic as well as definitions, examples, and discussion are on the right side; the section menu is on the left.
On the top side of the screen are the navigational buttons of the contents, which return you to the menu of the desired section. The bottom buttons allow you to choose the previous topic or next topic.
In many topics, the system of links refers to proofs, explanations, graphic illustrations, examples or some additional information.

In order to master a chapter, work through the examples contained in each topic, and at least scan the basic ideas of mathematical proofs. The procedure of proving propositions forms the corresponding level of thinking, and so rigorous mathematical proofs have to consider as an end in itself.

The authors welcome your suggestions for improvements.