Simone Marchesi, Alex Massarenti, Saeed Tafazolian
We study some properties of an embedded variety covered by lines and give a numerical criterion ensuring the existence of a singular conic through two of its general points. We show that our criterion is sharp. Conic-connected, covered by lines, QEL, LQEL, prime Fano, defective, and dual defective varieties are closely related. We study some relations between the above mentioned classes of objects using basic results by Ein and Zak.
{"title":"COVERED BY LINES AND CONIC CONNECTED VARIETIES","authors":"Simone Marchesi, Alex Massarenti, Saeed Tafazolian","doi":"10.4418/2011.66.2.12","DOIUrl":"https://doi.org/10.4418/2011.66.2.12","url":null,"abstract":"We study some properties of an embedded variety covered by lines and give a numerical criterion ensuring the existence of a singular conic through two of its general points. We show that our criterion is sharp. Conic-connected, covered by lines, QEL, LQEL, prime Fano, defective, and dual defective varieties are closely related. We study some relations between the above mentioned classes of objects using basic results by Ein and Zak.","PeriodicalId":107618,"journal":{"name":"Le Matematiche","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124131429","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}
We prove a generalization of Bernoulli's inequality and we apply this generalization to sharpen certain Weierstrass product inequalities
我们证明了伯努利不等式的一个推广，并应用这个推广来锐化某些Weierstrass积不等式
{"title":"A generalization of Bernoulli's inequality","authors":"L. Carli, S. Hudson","doi":"10.4418/2010.65.1.9","DOIUrl":"https://doi.org/10.4418/2010.65.1.9","url":null,"abstract":"We prove a generalization of Bernoulli's inequality and we apply this generalization to sharpen certain Weierstrass product inequalities","PeriodicalId":107618,"journal":{"name":"Le Matematiche","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116569164","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 : 2000-11-01DOI: 10.1007/978-3-0348-8020-6_2
A. Bensoussan, J. Frehse
{"title":"Stochastic games with risk sensitive pay off for n-players","authors":"A. Bensoussan, J. Frehse","doi":"10.1007/978-3-0348-8020-6_2","DOIUrl":"https://doi.org/10.1007/978-3-0348-8020-6_2","url":null,"abstract":"","PeriodicalId":107618,"journal":{"name":"Le Matematiche","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123318314","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}
In this paper, we give the maximal number of (k+r) -colouring of a graph with n vertices and chromatic number k . Also, we obtain the maximal values for chromatic polynomial of a graph.
{"title":"Note on graphs colouring","authors":"D. Marcu","doi":"10.21136/mb.1992.125898","DOIUrl":"https://doi.org/10.21136/mb.1992.125898","url":null,"abstract":"In this paper, we give the maximal number of (k+r) -colouring of a graph with n vertices and chromatic number k . Also, we obtain the maximal values for chromatic polynomial of a graph.","PeriodicalId":107618,"journal":{"name":"Le Matematiche","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126138648","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 : 1992-06-01DOI: 10.1080/00411459208203920
L. Preziosi
This paper deals with an initial-boundary value problem for the discrete Boltzmann equation confined between two moving walls at different temperature. A model suitable for the quantitative analysis of the initial boundary value problem and the relative existence theorem are given.
{"title":"Thermal creep problem by the discrete Boltzmann equation","authors":"L. Preziosi","doi":"10.1080/00411459208203920","DOIUrl":"https://doi.org/10.1080/00411459208203920","url":null,"abstract":"This paper deals with an initial-boundary value problem for the discrete Boltzmann equation confined between two moving walls at different temperature. A model suitable for the quantitative analysis of the initial boundary value problem and the relative existence theorem are given.","PeriodicalId":107618,"journal":{"name":"Le Matematiche","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116828297","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 : 1992-03-01DOI: 10.1007/978-3-0348-8627-7_34
V. Solonnikov
{"title":"On an evolution problem of thermocapillarity convection","authors":"V. Solonnikov","doi":"10.1007/978-3-0348-8627-7_34","DOIUrl":"https://doi.org/10.1007/978-3-0348-8627-7_34","url":null,"abstract":"","PeriodicalId":107618,"journal":{"name":"Le Matematiche","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125048953","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 : 1992-03-01DOI: 10.1007/978-1-4684-0447-0_5
G. M. Kremer, I. Müller
{"title":"Thermodynamics of light and sound","authors":"G. M. Kremer, I. Müller","doi":"10.1007/978-1-4684-0447-0_5","DOIUrl":"https://doi.org/10.1007/978-1-4684-0447-0_5","url":null,"abstract":"","PeriodicalId":107618,"journal":{"name":"Le Matematiche","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123996667","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}
The first part of the paper surveys the concept of resonance for T-periodic nonlinear problems. In the second part, some new results about existence conditions for nonlinear planar systems are presented. In particular, the Landesman-Lazer conditions are generalized to systems in R ^2 where the nonlinearity interacts with two resonant Hamiltonians. Such results apply to second order equations, generalizing previous theorems by Fabry [4] (for the undamped case), and Frederickson-Lazer [9] (for the case with friction). The results have been obtained with A. Fonda, and have been published in [8].
{"title":"Resonance and Landesman-Lazer conditions for first order systems in R^2","authors":"M. Garrione","doi":"10.4418/2011.66.1.15","DOIUrl":"https://doi.org/10.4418/2011.66.1.15","url":null,"abstract":"The first part of the paper surveys the concept of resonance for T-periodic nonlinear problems. In the second part, some new results about existence conditions for nonlinear planar systems are presented. In particular, the Landesman-Lazer conditions are generalized to systems in R ^2 where the nonlinearity interacts with two resonant Hamiltonians. Such results apply to second order equations, generalizing previous theorems by Fabry [4] (for the undamped case), and Frederickson-Lazer [9] (for the case with friction). The results have been obtained with A. Fonda, and have been published in [8].","PeriodicalId":107618,"journal":{"name":"Le Matematiche","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125524360","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 : 1900-01-01DOI: 10.1007/978-3-642-77769-1_12
O. Bogoyavlenskij
{"title":"Breaking Solitons. Systems of Hydrodynamic Type","authors":"O. Bogoyavlenskij","doi":"10.1007/978-3-642-77769-1_12","DOIUrl":"https://doi.org/10.1007/978-3-642-77769-1_12","url":null,"abstract":"","PeriodicalId":107618,"journal":{"name":"Le Matematiche","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127746291","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：