BARKA, NorelhoudaRapporteur: MIHOUBI, Douadi2023-05-062023-05-062015-06-10http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/36824Thanks to GOD almighty for the completion of this work. Only due to his blessings I could nish it. I would like to express my deepest gratitude to my advisor, Mr : D.Mihoubi, for his valuable advices and suggestions, I also would like to express my thanks to Mr : N.Ghadbane, for his advices. My thanks also go to the jury members for the honor they have done me by accepting to judge this modest work. I would like to thank my beloved parents for their encouragement who are so supportive to me throughout my life. My sisters, brothers deserve my wholehearted thanks as well, to all my friends and all people who have helped me during my study. this work is only a begining of my journeyenProducts of semigroups and applications on state machinesProducts of semigroups and applications on state machinesThesis