简介:Theartofprinting,oneofthefourgreatinventionsofChina,occupiesaprominentpositioninthehistoryofthescienceandtechnologyofChina.IntheSuiandTangDynasties,woodblockprintingwasinventedduetoarapiddevelopmentinculture,alongestablisheduseofpaperandinkandsealandstonecarving.Greatnumbersofhistoricalmanuscriptsandearlyexamplesofprintedmatterunearthedinsucces-
简介:<正>Weshowthatforanydifferentiableinvolutiononanr-dimensionalmanifold(M,T)whosefixedpointsetFisadisjointunionofrealprojectivespacesofconstantdimension2n,wehave:ifr=4nthen(M,T)isbordantto(F×F,twist),if2n
简介:SimbahascomeoutroaringagaininitsDVDdebut.“TheLionKing”sold3millioncopiesinthefirsttwodaysofitsnewhome-videorelease,distributorDisneysaidThursday.