The pure logical text is accompanied by fragments with descriptions how to use software.
Book contains a lot of examples and exercises to be executed with the help of computer.
It is clear enough to be used in K12, and exact enough for university level. It may be interesting for those who studies how to use logical methods and those, interested in automatic proof search. In Moscow University it is used both at Philosophy and Computer Science departments. As the basis of the course, proof-theoretic approach is taken. Main attention is paid to such fundamental notions as proof and inference, to proof search methods for different logical systems.