简介:§1.IntroductionThedeterminationoftheRamseynumbersisamainprobleminthestudyofthecombinatorialmathematicsandgraphtheory.However,itisstillaverydifficultunsolvedproblemtodate.HenceevaluationofthelowerboundoftheRamseynumbersseems(tobe)verynecessary.Abbott,H.L.[1]showedthataspecialformulaofthelowerboundoftheRamseynumbers:R(2~n+1,2~n+1)≥5~n+1.Erd(o|¨)s,P.andSpencer,J.[2]obtainedthataformulaofthelowerboundoftheRamseynumbersR(s,t)
简介:LetH=(V,E)beaК-uniformhypergraph.For1≤s≤К—1,ans-pathPn^(К,s).oflengthninHisasequenceofdistinctverticesυ1,υ2,…,υs+n(К-s)suchthat{υ1+i(К-s),…,υs+(i+1)(К-s)}isanedgeofHforeach0≤i≤n-1.Inthispaper,weprovethatR(Pn^(3s,s),P3^(3s,s))=(2n+l)s+1forn≥3.
简介:摘要Ramsey-Hunt综合征(RHS)为带状疱疹的一种少见类型,由水痘-带状疱疹病毒(varicella-zostervirus,VZV)重新激活引起。现报告一例我科收治的Ramsay-Hunt综合征。通过对患者的治疗和观察发现,Ramsey-Hunt综合症为带状疱疹一种较为严重的亚型,部分患者面瘫症状难以恢复,故早期明确诊断及足量抗病毒治疗显得尤为重要,对于无禁忌症的患者,应用中小剂量糖皮质激素治疗可促进神经症状缓解。