Pub Date : 2022-02-01DOI: 10.36120/2587-3644.v12i2.132-142
Vlad Serban
The theory of Daizhan Cheng [1] replaces B={0,1} with D={(1/0),(0/1)} and Boolean functions with logical matrices. Interesting and very important algebraical opportunities result, which can be used in systems theory. Our purpose is to give a hint on the theory of Cheng and its application to asynchronicity.
{"title":"Boolean asynchronous systems vs. Daizhan Cheng’s theory","authors":"Vlad Serban","doi":"10.36120/2587-3644.v12i2.132-142","DOIUrl":"https://doi.org/10.36120/2587-3644.v12i2.132-142","url":null,"abstract":"The theory of Daizhan Cheng [1] replaces B={0,1} with D={(1/0),(0/1)} and Boolean functions with logical matrices. Interesting and very important algebraical opportunities result, which can be used in systems theory. Our purpose is to give a hint on the theory of Cheng and its application to asynchronicity.","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127178597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-01DOI: 10.36120/2587-3644.v12i2.7-18
Liubomir Chiriac, D. Cozma
Mitrofan Cioban was born on January 5, 1942 in Copceac, Tighina county, Moldova(Romania) in the family of the farmers Mihail and Tecla Cioban. He was the fourth ofthe seven children. His parents encouraged Mitrofan to get as good an education as waspossible at the time. They sent him to a boarding school in the neighboring village ofVolontiri. Then, in 1959, he graduated from the high school of Volontiri village. Aftergraduation, he worked for a year in the local agricultural organization.
{"title":"In memoriam - Academician Mitrofan Choban","authors":"Liubomir Chiriac, D. Cozma","doi":"10.36120/2587-3644.v12i2.7-18","DOIUrl":"https://doi.org/10.36120/2587-3644.v12i2.7-18","url":null,"abstract":"Mitrofan Cioban was born on January 5, 1942 in Copceac, Tighina county, Moldova(Romania) in the family of the farmers Mihail and Tecla Cioban. He was the fourth ofthe seven children. His parents encouraged Mitrofan to get as good an education as waspossible at the time. They sent him to a boarding school in the neighboring village ofVolontiri. Then, in 1959, he graduated from the high school of Volontiri village. Aftergraduation, he worked for a year in the local agricultural organization.","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115704126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-01DOI: 10.36120/2587-3644.v12i2.120-131
Liubomir Chiriac, Natalia Bobeică, Natalia Lupashco, Dorin Pavel
This paper studies some properties of CM-groupoids with multiple identities and medial topological left loops. The conditions for a CM-groupoid to become a CM-quasigroup were found. A new method of constructing non-associative medial topological quasigroups with left identity is given. Various examples of quasigroups with multiple identities have been constructed
{"title":"On CM-groupoids with multiple identities and medial topological left loops","authors":"Liubomir Chiriac, Natalia Bobeică, Natalia Lupashco, Dorin Pavel","doi":"10.36120/2587-3644.v12i2.120-131","DOIUrl":"https://doi.org/10.36120/2587-3644.v12i2.120-131","url":null,"abstract":"This paper studies some properties of CM-groupoids with multiple identities and medial topological left loops. The conditions for a CM-groupoid to become a CM-quasigroup were found. A new method of constructing non-associative medial topological quasigroups with left identity is given. Various examples of quasigroups with multiple identities have been constructed","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129434629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-02-01DOI: 10.36120/2587-3644.v12i2.63-73
D. Cozma, Vadim Repesco
In this paper a cubic differential advertising model with a singular point O(0,0) is studied. The dynamics of the system is investigated and the global phase portraits are obtained. A small amplitude limit cycle is emitted by the Hopf super critical bifurcation.
{"title":"Dynamics of a cubic differential advertising model","authors":"D. Cozma, Vadim Repesco","doi":"10.36120/2587-3644.v12i2.63-73","DOIUrl":"https://doi.org/10.36120/2587-3644.v12i2.63-73","url":null,"abstract":"In this paper a cubic differential advertising model with a singular point O(0,0) is studied. The dynamics of the system is investigated and the global phase portraits are obtained. A small amplitude limit cycle is emitted by the Hopf super critical bifurcation.","PeriodicalId":340784,"journal":{"name":"Acta et commentationes: Ştiinţe Exacte şi ale Naturii","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116840238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：