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1、TheQuantumMechanicsofMindsandWorldsJEFFREYALANBARRETTOXFORDUNIVERSITYPRESSTHEQUANTUMMECHANICSOFMINDSANDWORLDSTItisbookhasbeenprinteddigitallyandproducedinastandardspecificationinordertoensureitscontinuingavailabilityOXFORDUNIVERSITYPRESSGreatClarendonStreet,Oxf
2、ordOX26DPOxfordUniversityPressisadepartmentoftheUniversityofOxford.ItfurtherstheUniversity'sobjectiveofexcellenceinresearch,scholarship,andeducationbypublishingworldwideinOxfordNewYorkAucklandBangkokBuenosAiresCapeTownChennaiDaresSalaamDelhiHongKongIstanbulKara
3、chiKolkataKualaLumpurMadridMelbourneMexicoCityMumbaiNairobiSaoPauloShanghaiTaipeiTokyoTorontoOxfordisaregisteredtrademarkofOxfordUniversityPressintheUKandincertainothercountriesPublishedintheUnitedStatesbyOxfordUniversityPressInc.,NewYork©JeffreyA.Barrett1999Th
4、emoralrightsoftheauthorhavebeenassertedDatabaserightOxfordUniversityPress(maker)Reprinted2003Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmitted,inanyformorbyanymeans,withoutthepriorpermissioninwritingofOxfordUniversi
5、tyPress,orasexpresslypermittedbylaw,orundertermsagreedwiththeappropriatereprographicsrightsorganization.EnquiriesconcerningreproductionoutsidethescopeoftheaboveshouldbesenttotheRightsDepartment,OxfordUniversityPress,attheaddressaboveYoumustnotcirculatethisbooki
6、nanyotherbindingorcoverandyoumustimposethissameconditiononanyacquirerISBN0-19-924743-9ForMartha,Thomas,andJacobAlexanderweptwhenheheardfromAnaxarchusthattherewasaninfinitenumberofworlds;andhisfriendsaskinghimifanyaccidenthadbefallenhim,hereturnsthisanswer:'Doyo
7、unotthinkitamatteroflamentationthatwhenthereissuchavastmultitudeofthem,wehavenotyetconqueredone?'(Plutarch,OntheTranquillityofMind)PREFACETHISbookisaboutthequantummeasurementproblem,HughEverettIll'sproposedresolution,andsomeoftheattemptstounderstandhowitwassupp
8、osedtowork.Whilethereisabriefreviewofthestandardfor•mulationofquantummechanics(completewithadescriptionofatwo-slitexperiment!)andashortappendixdescribingtheHilbert-spaceform