Dear readers, this book that you are currently holding was born thanks to the hard work and dedication of many students.

In the many years of schooling I have had the privilege of teaching, I have gone through various periods of development. Particle Book A is a concentration of lessons that took place in the years 2000-2008, mainly in the north of the country.
I remember five consecutive years in which I taught an exceptional concentration of groups. Every Wednesday it would open with a regular study at my home in Zichron Yaacov, from there I went to teach a group at noon in Nofit near Tivon, from there I continued in the evening to teach a
group in Nahariya, and from there I went to teach a group at Kibbutz Ayelet Hashahar.
I would return home to Zichron Yaacov around midnight and the trip to Kinneret on empty roads is remembered to me as a tremendous and full of energy experience that took place every week for nearly five consecutive years.
In the lessons, my students wrote down what was said, and from the transcript of those lessons, the particles of the book were collected.
In the five years between 2010 and 2015, I experienced the experience of taking over the parts of Yemima. Although we stopped the experience with a Supreme Court ruling, the process taught me that a
free particle system should be created that would be accessible to all students of cognitive thinking wherever they are.
I am full of gratitude to the students who have concentrated the material over the years, to the students who have collected and preserved the material, and to the students who have filtered, edited and helped me with proofreading.
To all of these I remind you that the book is yours and for you.
This book is not a reading book, it is a textbook, thought and deepening, and as such it should be treated.
With the blessing of direct strength to all of you.