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1、華南師范大學(xué)碩士學(xué)位論文TheExtremalMatrixofRSmatrices姓名:譚學(xué)忠申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):運(yùn)籌學(xué)與控制論指導(dǎo)教師:柳柏濂2003.6.11introductionandnotationLetA=(a/j)bea(0,1)matrixofordernandlet厶denotethesetfl,2,~,艇;Forgivensubsets璉and多of磊,8£建添,躦bethesubmatrixofAconsist
2、ingofallrowsnumberedo,ot∈O/,andallcolumnsnumbered黟如∈8Aissaidtobereducible娃thereexistnonemptysubsets“,0of霸suchthai。&n盧一垂,“u聲一厶,A[a,盧j=00tlmrwise。Aisirreduci接eEquivalentlyAisreducibleifthereexistapermutationmatrixPslchthat
3、pAP驢#善三),whereBandDaresquarematricesSincetheprincipaldiagonall’8havenoeffectontheirreducibilityofA,wesupposeinthispaperthat魄=0,i=1,2,,骼unlessspecialIyindicateAis‘theadjacencymatrixofadigraphGwithnverticesanddarcsAisirred
4、ucihle蠢andor&vif溉di豁aphisstrongiyconnected弒、AprimalsubgraphOfGisthegraphobtainedfromGbydeletingonecortex,say,andallthearcsgoingoutfromiorintoitTheadjacencymatrixcorrespondingtothisprimalsubgraphistheprincipalsubma£rix囊of
5、矗obtained姆deletingrowandcolumniofAInRef[4],BSchwarzconjecturedthatifGisastronglyconnecteddigraphwithoutloops,with囂≥3verticesand纛arc8,where鎏《囂~t)i21i≤g≤禮(憶一1),thenGhasastronglyconnectedprimalsubgraphHeverifiedhisCOnjectur
6、efor丸∞3,4,5TheCOnjectureisageneralizationofaresultofBrualdiandHwaag《蕊,Lemmal2b;;。,foragiven(011)matrixA;(aij)ofordern,wedenoteby鱷(A)ands(^),i—l,,‰thenumberoftheoffdiagonalOsandls,respectivelyintheunionofrowandcolttmniofA
7、,and謗s棼;wedenotethetotalnumberofISinAObviously霹馨》4(A》=2《魏~≥),i一1,,%(1j’Hs(以)=;∑si(舢(2)。蛹iInRef[1],DavidLondonshowedthefollowingtheoremwhichimpliedthevalidityoftheconjectureforallnLemma1。1LetA≈垃話》如玨韓irreducible簿≯matrix醇o(jì)d
8、er%satisfyingait∞0,i;1,一,禮,Ifs(A)≥【n(n~1)/2】1,thenthereexist《least蜉囂£irreducibleprincipalsubmatrizA《of丑,Thisisabeautifulresult,Howeverthelowerboundofs(A)isnotnecessarM孫r囂=5,DavidLandonshowedthatLemma1,lholdsfors(A)≥10,an
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