initiallyinitiateinitiationinitiatorinjectioninjectiveinjective functioninjective mappinginletinnateinnerinner automorphisminner compositioninner jordan contentinner measureinner operationinner productinner product of setsinner product of two vectorsinner product of vectorsinner product spaceinner regioninner suminnotational forminnovateinnovationinnumerableinnumerablyinnumerousinorder traversalinprimitive systeminputinput alphabetinput bitinput datainput deviceinput equationinput measureinput outputinput output deviceinput output managementinput symbolinput tape expressioninradiusinscribableinscribeinscribedinscribed angleinscribed circleinscribed circle of a polygon